Main Characters (Shijima Tsukishima) | West Yomogi High School | Other Characters | Spoiler Characters
Characters of the manga who are spoilers by just talking about them.
WARNING: Every SINGLE one of these character pages are a Walking Spoiler by default, making it impossible to talk about them without revealing major plot spoilers. You Have Been Warned. These are the most spoilery characters of the manga that even talking about who they are will ruin a reader's experience.
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Big Sis
Shijima's Sister/Big Sis
Voiced by: Mai Fuchigami (VOMIC)
First Appearance: Chapter 1
That's too much of a development for a shut-in, don't you think?
—Sis to Shijima
- All of the Other Reindeer: Played for Drama. A part of her past reveals that she was mostly shunned by her other classmates, due to her different hobby.
- Aloof Big Sister: While she does care about Shijima to some extent, her experiments clearly come first.
- Aloof Dark-Haired Girl: Big Sis is a black-haired and intelligent stoic young woman who is mostly seen with an aloof expression to her face. She is rather unmoving, rarely showing any emotion at all.
- Ambiguously Evil: While not an evil of sorts, her rather bizarre experiments is what gives her the impression of being evil, such as when she sends her younger sister Shijima into the Dream World using the Fish With Names from the Raw Fish Generator for one of her experiments.
- Animal Motif: Fish is her main motif, which is seen in her experiments, her hair clip, and even the Raw Fish Generator, Flounder Block, Twin-Flounder Motor, and Raw Fish Converter. Not to mention, the Fish With Names, which are used as a key to transport someone into the dream world. Ironically, she is later seen as a fish by Shijima in Chapter 45, though she now emerges as a soul in the shape of that, due to her being dead.
- Anti-Hero: Despite her altruistic intentions of pursuing the goal of allowing unrestricted freedom to humans, Big Sis is not without her questionable grey morals, going so far in destroying the fabric of the simulation imposed by the Gardener, which allowed the likes of her rogue clone to cause problems, even putting her into Anti-Villain territory, where she was willing to risk the entire world into chaos for her goals. She still cares for her sister, but as shown in the first few chapters their relationship as siblings was mostly transactional. Until Chapter 45 where she finally atoned for her actions and the damage it ultimately caused at the end.
- Armor-Piercing Question: She has no qualms in brutally calling out the Gardener by making West Yomogi disappear and later altered completely through her invention.Sis: "I can't...? Says who? The architects of the town? God?"
- The Atoner: In her dying moments, Big Sis as a fish confesses as to how everything falls apart within the simulation because of her own actions and her clone's actions, before she passes away. As a soul, she later gives her little sister a Last Request: go back in time during the school festival and reverse everything, but by keeping her distance away from others to not interfere with the changes.
- Batman Gambit: She initiates her plan of uncovering the true nature of the Gardener's hold of the simulation by creating a sea urchin-like device that allows her to peer through the emotions and the thoughts of someone affected by it. While it was successful at the end when she allowed her to have humanity the power of unrestrained freedom through reality warping, such plan soon came consequences when chaos becomes commonplace everywhere. Not helping matters is the clone that she unwittingly created started her own goal to unlock reality furthermore, with the intention of causing even more chaos.
- Be Careful What You Wish For: Big Sis orchestrated her plans to dismantle West Yomogi to alter the entire world via everyone's imagination, in an attempt to destroy the Gardener's creation for good, in envisioning a free world that fits to her own specifications. While she succeeded in doing so, at least from the Gardener's POV, Big Sis subsequently went to the Gone Horribly Right territory, after her rogue clone granted humanity the power to change themselves in Chapter 40. What her past actions resulted is her own clone causing a feedback loop that almost plunged the world into chaos.
- Beneath the Mask: Outwardly Big Sis is the epitome of an intelligent stoic. Though one gets a good look beneath that façade through her buried past, as Shijima lampshades it, which showed a completely opposite side of her during her past as a student.
- Best Friend: With the bright-haired Yomikawa. Big Sis is basically the mirror to her younger sister who also has Majime, a bright-haired girl, as her best friend.
- Bully Magnet: In the past, where she was bullied for her own hobbies.
- Collector of the Strange: A specific one, and its fishes. She is a known collector of unusual fishes, known as Fish With Names, whom they turned out to be key power sources for Raw Fish Generator and Raw Fish Converter to connect anyone into the dream world, with the fish being produced by the former and converted by the latter.
- Dark and Troubled Past: Spent most of her childhood as a social pariah, in part due to her conflicting hobby amongst her other classmates. This led her to be shunned almost all of the time, leading to her Friendless Background. Not to mention, she and Shijima are orphaned who don't have parents at all, who were both abandoned by them (or so it seems).
- Disappointing Older Sibling: Her younger sister Shijima was often neutral and apathetic towards her moral ambiguity through her experiments with the Dream World through the Fish With Names. However, Shijima later became disillusioned with what happened during the climatic battle between her sister and the Gardener. Temporarily Played Straight in Chapter 34, when Shijima rather apologizes for the damage she caused.
- Divergent Character Evolution: She's virtually similar to Mina's sister from the one-shot as Sis copies her appearance and her Wrench Wench personality. But as shown in the next few chapters, Sis later becomes a character of her own when her characterisation becomes completely fleshed-out, including a different personality.
- Emotionless Girl: She's a stoic who is rarely seen showing any emotion even to her own sister and Yomikawa, her complete opposite. It is hard to tell if she even expresses her emotions or not. This is stemmed from the bullying she went through during her time as an elementary student.
- Everyone Calls Her "Barkeep": She is often only known by her title as "Sis" or "Big Sis", as her first name is never revealed.
- Foil: To the Gardener as they are both connected to the world's true nature as a simulation. The Gardener represents natural order and her complete adherence to the status quo, while Big Sis represents chaos and unbound freedom to it. Unlike the Gardener who sticks to her own guns to maintain the natural order with her bound rules for her utopia, Big Sis actively wants to break all of it by making humans unbound to the simulation's rules. The Gardener uses magical powers to maintain the simulation, while Big Sis uses her invented technologies to alter it. Furthermore, the Gardener is a cold idealist, while Sis is a hardline pragmatist.
- Friendless Background: Sis, for all of her years, never has friends to begin with, especially during her elementary years, when she was treated as an outcast for her hobby. The only friend she has is Yomikawa, but it came much later in her time during her high school years.
- Gadgeteer Genius: She is an inventor, who is known for her strange technologies, including the Raw Fish Generator, a giant drill excavator, Flounder Block, Twin-Flounder Motor, and Raw Fish Converter.
- Idealist vs. Pragmatist: Of the Pragmatist scale. This is especially known, when she comes into conflict with the Gardener, since she knows all too well about the occupation and the inner workings of the town itself, including the town's creation.
- Killed Off for Real: Chapter 45 shows a fish sitting in an abandoned house, which turns out to be Sis' own soul inside of it, who is slowly dying. After her last interaction with her younger sister, Sis finally disappears for good.
- Loners Are Freaks: While smart on the outside, Big Sis in the past was a loner for most of the time, where she was treated negatively by her peers due to her interests.
- Men Can't Keep House: Gender-inverted. Her and her sister's apartment room is such a mess that everything is on the floor, including spare parts and other garbage scattered across the room. Also Played for Laughs when Big Sis points out to Majime that everything, even the most ridiculous items she has, on the floor is "needed" for her. For her impossible intelligence, housekeeping and cleaning is not her strength.
- Moral Pragmatist: Her "experiments first" mentality is already an indicative flag of this trope. While she's willing to see the reality behind West Yomogi and the true nature behind the entire town itself, she resorts to less-than-ethical means of her own Ambiguously Evil goals to alter it with her technologies. She is not inherently evil under circumstances, but her subsequent actions of altering the town to her inherent specifications surfaced more problems than the inherent "goodness" she attempts to do so.
- The Nameless: She has no name at all and is often called by her surname.
- No Social Skills: Big Sis never interacted to other people throughout her life, as she spent most of her childhood being by herself, resulted in her being bullied by her peers. It was Lampshaded in one scene where her teacher told her to be (presumably) social towards others. Even in the present she only interacts with the closest people she knew, including Yomikawa, her sister, Majime and Mogawa.
- Perpetual Frowner: She rarely shows a smile to her face, thanks to her stoic and unsmiling personality.
- Promoted to Parent: At least to her little sister Shijima, as they don't have parents on their own, but she does very little parenting throughout the story as she's more focused on her experiments than just taking care of her sister, let alone taking care of their apartment room which is a mess.
- Reality Warper: A part of Sis's modus operandi to change West Yomogi and make it disappear through her technologies.
- Self-Duplication: In Chapter 40, it is revealed that Sis is able to create clones of herself, as it is shown when the original Sis, Majime and Shijima were capturing the other rogue Sis clone, as well as her plan to take the Key in an attempt to unlock the humans the ability to change themselves in a whim, which is mostly triggered by Ayaka's performance.
- Shadow Archetype: She and her Evil Doppelgänger are the shadows to one another, where they are both obsessed in granting humanity unrestrained freedom and with their actions became significantly impactful at the end. The difference is that Big Sis wants to remove the stringent rules of the simulation, while her clone wants to allow humans to be better versions of themselves, in spite of the obvious damage. The clone is a representation of what happens when Sis goes beyond her own goals, eventually causing the collapse of the simulation's natural order.
- The Smart Girl: She's not only a university student, but also a brilliant scientist and an inventor who has invented fish-related technologies at her disposal.
- Soul Jar: By the time Shijima meets Sis in the now-ruined West Yomogi, she finds her sister inside in what looked like her fish ornament. It is revealed that Sis' soul is now inside of it in her final moments.
- The Spock:
- She is this to her younger sister's Kirk and to Majime's McCoy. Out of the three, she's the one who is logical and intellectual yet cold and emotionally distant, being task-oriented who puts emotions aside for logic.
- She is also this to the Gardener's Superego/Kirk and Yomikawa's Id/McCoy. While Yomikawa is philosophical yet cheerful, as well as with the Gardener being emotionally balanced and the metaphorical representation of natural order, Big Sis is emotionless and stoical who is an insightful intellect.
- Stoic Spectacles: She wears black glasses, which fits her personality as a stoic, emotionless inventor and researcher.
- Suspiciously Similar Substitute: It's no surprise that she's exactly almost similar to Mina's sister from the one-shot, since Mina's appearance, personality and her signature trait of being a Wrench Wench were directly copied onto Big Sis. The only minor difference is that Big Sis is a perpetual stoic, completely Broad Stroking the comical but black humour personality Mina's sister had in the one-shot.
- Transplant: She's more so a Suspiciously Similar Substitute to Mina's sister from the one-shot, as her entire characterisation and appearance is carried over to this manga. Minus Mina's sister's brief comical personality.
- Well-Intentioned Extremist: Big Sis' main goal is to let humanity be freed of restrictions from the Gardener that have been embedded within the simulation through granting them reality powers. But on the other end, she is an extremist who is willing to cause a chaotic imbalance to the simulation via that said goal.
- What Happened to the Mouse?: Post-Chapter 30 reveals that Sis is nowhere to be seen, as she was last seen with Shijima in what looked like the Parthenon temple in Greece. It is unknown where she has been after Chapter 30. Subverted in Chapter 36, when she makes her appearance again. After Chapter 40 she disappears again, but Chapter 45 she makes a brief appearance, except that she is now dead and is now a soul in the form of a fish.
- What the Hell, Hero?: While she gets her wish of altering West Yomogi in an attempt to spite the Gardener, her efforts went off the rails as her rogue clone became bent in her efforts to give humanity the ability to change themselves, instead of just changing the reality according to their imagination. Her efforts instead caused more problems than good.
- Wrench Wench: She's an adept mechanic and an inventor who invented various fish-related technologies and is an expert in engineering.
The Gardener
The Gardener
First Appearance: Chapter 7
It's a complete and utter mess...!!
—The Gardener
"I finally found you. So you did this. You're the one who's been making a mess of the town."
A mysterious and rather complex entity with a rather unknown motive. She is the member of an unknown race known as The Gardeners, hence her nickname as such.- Anti-Hero: Her imposed restrictions of the simulation, while seen as means to keep her idealistic utopia in check, is not without the questionable decisions she makes, including the lack of deaths that happens in West Yomogi. She even becomes an antagonistic threat towards Big Sis in Chapter 30, warning her that it is just a "warning shot" and any interference is not tolerated.
- Berserk Button: Everything that does not align rationally well in West Yomogi would be enough to put her into a hammy and sometimes vitriolic fit. On a more serious note, however, when Sis was dead-set in ruining West Yomogi, The Gardener exhibits a more murderous personality when her creation was in danger, almost to the point of initiating a huge battle between her and Sis.
- Beware the Silly Ones: The Gardener may be a comedic goddess with a Large Ham personality, but she can go into a Rage Breaking Point whenever her creations are harmed.
- Crazy-Prepared: After the destruction of the original West Yomogi from Sis, Chapter 34 reveals that she created yet another copy of the town, albeit miniaturised, which is hidden from anyone else.
- Gold and White Are Divine: A partial subversion. While The Gardener is a deity who is cladded in white dress, as well as having a white hair, there is nothing gold around her.
- Hero Antagonist: While her views of natural order within the simulation borders to antagonistic approaches like attacking Big Sis for her attempts of dismantling it, she only does it to prevent any damages to the simulation. Not that her actions started a red flag in the first place.
- Idealist vs. Pragmatist: Of the Idealist scale. Not only she created the town of West Yomogi, but she also made it sure that no one dies under her watch. This kind of rule-bending alone unfortunately did not go well, when her plans were put under the radar of Big Sis, who seeks to end it all.
- I'm a Doctor, Not a Placeholder: In one instance, she hates being mistakenly compared to a police officer.Shijima: Are you an officer?The Gardener: Do I look like one?
- It's Personal: Being the fact that she has finally known all too well about Sis' plans to alter West Yomogi, when she later finds out in Chapter 30, it later culminates into an almost destructive stand-off.
- Knight of Cerebus: Her first appearance is mostly downplayed, since she was seen as a comic relief character. That changes in Chapter 30, where she suddenly attacks Big Sis, showing that she has known her true intentions of the town from the beginning, leading to a near-destructive stand-off and with Sis completing her goal of destroying the town's illusion. Her actions set off the Wham Episode, as the manga becomes slightly darker and less comedic, though there's still some shades of comedy seen.
- Large Ham: Her rather bizarre sense of overseeing order within the town tends to border into this.
- The Maker: She is the true creator of West Yomogi, or at the very least she's the one who oversees it.
- Mind over Matter: She has the power of psychokinesis, which she exhibits it when she throws various vehicles towards Sis.
- Mystical White Hair: Her long, white hair is befitting for her status as the mysterious deity of Shijima's world.
- Nobody Can Die: Played Straight. Being the creator of West Yomogi, that would mean that anyone under The Gardener's watch would never be killed through any means, including accidents. Judging from the dialogue Sis mentioned regarding her doing it from years prior to it, it's assumed that she's been doing it for years.
- Only Known By Her Nickname: Her so-called "name", "The Gardener", is a nickname.
- Out-of-Character Moment: The Gardener has some hammy moments as the deity of West Yomogi, and would point out any bizarre inconsistencies as "a mess". During Chapter 30, she breaks character and goes into Serious Business mode. She turns from a comic relief goddess into a murderous maniac when Big Sis initiated her own plans to alter the town.
- Pint-Sized Powerhouse: Her height is comparable to a fourth-grader student but she is a powerful deity with psychokinetic powers, who is able to square on against Big Sis.
- Prongs of Poseidon: A bident variant, where she is always seen equipping a bident with her.
- Really 700 Years Old: Being a deity, she is possibly much older than anyone else, in spite of her rather childlike appearance.
- The Reveal: Not only The Gardener is later revealed to be the one overseeing West Yomogi, but there are no reported deaths under her watch, when later deduced by Big Sis in Chapter 30. This is also revealed that West Yomogi was a simulated creation by the Gardener.
- Token Mini-Moe: She is the smallest of the cast, and the only one who looks like a child. Inverted, when she is the oldest of the cast, as well.
- Utopia Justifies the Means: Plucking the meaning of death in her own world, so that nobody will be dead from all forms of accidents and life-threatening situations under her watch. Though her rather extreme actions of committing to it put her on Sis' radar, who priorly warned that everything she does to West Yomogi is simply a "calculation" and a "Papier-mâché".
- Walking Spoiler: Her appearance in West Yomogi suggests more to her motivations than just a simple bystander.
- The Watcher:
- She is the overseer of West Yomogi. Her intentions are rather mysterious for the first few chapters, until it reached within the manga's Wham Episode, Chapter 30, when Sis knew about her motives.
- Chapter 34 has this, when Shijima and Majime later arrive at another city that is miniaturized in nature. Turns out that she has created another copy of West Yomogi, except in the middle of nowhere and is in charge of watching it, presumably to protect it against Reality Warpers like Sis.
- What Happened to the Mouse?: The Gardener is largely absent after the events of Chapter 40, despite being a major character. The only last appearance she makes is reduced to a cameo in Chapter 48.
The Neighbours
Shijima's Neighbours
First Appearance: Chapter 13
- Ascended Extra: The blonde-haired girl started off as a cameo in Chapter 7 and the black-haired girl and a Nuko-esque cat appeared as cameos in Chapter 14. They later become recurring characters after the latter chapter.
- Contrasting Replacement Character: Despite being Expies to Chito and Yuuri, they are the opposite replacements to both of them from Girls' Last Tour and they bear opposite traits to their predecessors, which Foreshadows their true nature as them not being the same to Chito and Yuuri that Shijima encountered in Chapter 48.
- In general, unlike Chito and Yuuri who are dressed in their military clothing in their entire appearance as well as living in an empty world, the neighbours are dressed in a more casual clothing and are obviously living in a more populated environment.
- The black-haired neighbour is this to Chito. While Chito is a stone-faced, level-headed stoic who is a quiet girl, the black-haired neighbour is neither of those.
- The blonde-haired neighbour is this to Yuuri. Despite both being similar in personality, their main difference is their appearance. Unlike Yuuri where she flows her hair freely, the blonde-haired neighbour often wears her hair in a ponytail.
- Expy: Of Chito, Yuuri and Nuko from Girls' Last Tour, which happens to be made by the same author. They also have the same appearance, as well. Averted as they are not the same as the ones that Shijima saw in the Afterlife Express, who are more so closely resembling to both Chito and Yuuri from tkmiz's previous work, as their simulation counterparts embody a vastly different characterisation.
- Everyone Calls Him "Barkeep": They are both referred to as "neighbours" by Shijima as they don't have names.
- Tomato Surprise: It is revealed in Chapter 48 that the "neighbours" that Shijima saw in the train are not the same when they do not know about her at all. The Plot Twist is that they are not the same as the neighbours, but they are Chito and Yuuri as souls inside the train.
- Walking Spoiler: It is hard to talk about them without revealing the fact that they are not the same, both in character and in appearance, to Chito and Yuuri that Shijima met inside the train, as their consciousnesses from their previous lives after Girls' Last Tour's final chapter have been uploaded into the simulation.Hint
Yomikawa
Yomikawa
First Appearance: Chapter 19
An eternally beautiful girl is eternally a high school girl...
—Yomikawa
- Ambiguously Human: Yomikawa mentioned that she has been existing for far long before even existence came to be, pondering at the idea that she is not even close to being one. There's also other subtle hints that she is not human, as she seemingly has a far-reaching, omniscient understanding of the state of the world they are in, which is often an ability that deities like the Gardener has. She particularly knows of Big Sis' reality-warping abilities during the events of Chapter 30, as well as revealing to Shijima about their own world being a simulated reality, complicated matters that no ordinary third-year high-school students easily know.
- Anthropomorphic Personification: She turns out to be a walking library in the fourth dimension. In essence, Yomikawa embodies theoretical and astute knowledge in spite of her exterior comical persona, who has extensive understanding of philosophical books.
- Best Friend: To Big Sis. And the first one Sis befriended.
- Bookworm: She is an avid reader of books, particularly philosophical ones including Osamu Dazai and Friedrich Nietzsche's books. Even lampshaded by the book that sits atop her head.
- Dumb Blonde: Zigzagged. While Yomikawa is technically not a literal dumb blonde, since she owns a library and is an avid reader of books, her rather absurd reasons for repeating high school has to do with her claims about eternal beauty being a contributor to being an eternal high school student.
- Early-Bird Cameo: Although she appears on the first cover art along with other major characters, Yomikawa can be seen as early as Chapter 1 looking out of the window at the end of Shijima's first day at school.
- Foil: She is the complete opposite to Big Sis in terms of her hair colour and her personality. The similarities is their knowledgeable thinking, but the approaches of doing so are polarly different from one another. Whereas Big Sis is a stoic, Aloof Big Sister to Shijima who is a Gadgeteer Genius, being a crazed inventor of her fish-themed technologies, Yomikawa is a Pollyanna Bookworm who seems to have a philosophical and sometimes theoretical grasp of the knowledge of their own world.
- Foreshadowing: There's several things about Yomikawa that isn't who she really is within her bookworm persona. From the start, she mentions that she's a third-year high school student and has known Big Sis, but she mentions a lot of complicated topics that no normal third-years would generally mention with only Big Sis herself being able to comprehend them. While it is still up the air about Yomikawa existing way before even existence became a thing, it is clear that she is not even close to being a human at all. She is also well-aware of Big Sis' involvement in handing the powers of Reality Warping to humanity during Chapter 30, which again Big Sis was only aware of it. There's also the fact regarding her seemingly vast knowledge of philosophical books and texts from different periods in time, ranging from Osamu Dazai, Friedrich Nietzsche and even Dante Alighieri which are often difficult works for average readers to understand; in fact, Yomikawa has a clear and coherent understanding of them. But the most telling of all, Yomikawa, in a strange-looking library, tells to Shijima how she knows everything about the world being a simulated reality in the first place, with Chapter 44's The Reveal pounding the nail in the coffin.
- Genius Ditz: Despite her Dumb Blonde tendencies as well as her ditzy nature, Yomikawa is extremely smart to the point that she's a walking library due to her fascination with philosophical books (something no other regular students even do), as well as having a house with a giant library and her own world that is full of books from different time periods.
- Held Back in School: Played for Laughs. It was more of Yomikawa's decision, albeit bordering to reductio ad absurdum, much to Sis's annoyance, to repeat third-year high school several times, as she lampshades it from her conversation with Sis:Yomikawa: C'mon, we were senior year classmates.Sis: Why in the world are you still in high school?Yomikawa: An eternally beautiful girl is eternally a high school girl...
- Insane Troll Logic: Invoked, as she claims that being an "eternally beautiful girl" is a contributor to being an eternal high school girl.
- Last-Name Basis: Yomikawa is her surname as she is called by most of the major characters with it, but her first name is unknown. On the other end, Yomikawa calls everyone by their last names.
- Long Hair Is Feminine: She has a long, back-length blonde hair that emphasises her femininity.
- Meaningful Name: Yomikawa means "big reader" in English, which befits her hobby as an avid reader.
- Ms. Exposition: During Chapter 44 where she reads a book to Shijima about a civilisation that was destroyed by a pandemic and a Robot War, which is suspiciously identical to the backstory of Girls' Last Tour. It doesn't help the fact that the "story" Yomikawa exposits is basically connected to ShimSim.
- Obfuscating Stupidity: Despite her overt comicality Yomikawa is actually intelligent on the outside, who has a deep interest in philosophies. She often mentions things that are considered complicated to an average human, including The Divine Comedy and the Bible's Old Testament. This is due to her natural obsession to philosophical books.
- Older Than She Looks: Despite Yomikawa being in high school, it is later revealed that she is a young adult, who is within the same age as Big Sisnote , due to her repeating high school for several times. This also makes her the oldest student in the entire West Yomogi High School.
- Walking Spoiler: Yomikawa's appearance and her obsession to philosophical books and her mysterious nature suggests that there is more to who she is than being a simple student.
The Clone
Big Sis' Clone
First Appearance: Chapter 38
I'm not going to make people disappear. I'm just unlocking the potential for people to change. People will be able to change into the best version of themselves.
—Big Sis' Clone
When one Sis isn't enough.
One of Big Sis's clones encountered by Shijima and Majime.- Badass Boast: How she mocks her own prime regarding her plans for the town and the whole world.Big Sis: And the world will fall into total chaos in the blink of an eye. That is your true intention. Don't make reasons up.Big Sis's Clone: "Your"? You mean "my", right?
- The Bad Guy Wins: In a sense as she is successful in breaking the simulation's status quo furthermore by using the school festival performance by Mosasa Dogs during Chapter 40, which eventually results in permanently destroying the simulation's natural order five chapters later.
- Big Bad: She is the closest the manga ever has to have a main antagonist. She makes a grand appearance in Chapter 38, attempting to free-fall her prime's entire world into chaos by feedback loop, during the conflict with her original, Shijima and Majime. Her intention is to grant humanity the ability to change themselves in a whim through the Key, which would directly cause the said feedback loop in the first place. Despite being a one-off antagonist, her actions lead to the collapse of the simulation in later chapters.
- The Chessmaster: She masterminded her plans of giving humanity the newfound power to change themselves by using the Mosasa Dogs and their concert during the school festival as a catalyst, in such way that it would start blending in the world's code. While a few characters start to suspect that she is not the real Big Sis, she was able to blend in with Shijima, who was watching past images of the pre-altered West Yomogi in the festival, before she reveals that the past is nothing more than a material into creating a newfound future she destines, thus showing her true nature and foreshadowing the events of Chapter 40.
- Cover Identity Anomaly: Averted. While she is the actual clone of the real Big Sis, the clone is distinguished by the lack of the fish hairpin on her head, which the prime is always seen wearing.
- Evil Doppelgänger: As a clone of Big Sis, she starts off as her imperfect, partial copy after the latter's experimentation in the Rock World unintentionally created her. Despite being functionally similar to her prime, this clone is a vicious rogue to her original, as she has ulterior motives of her own. In Chapter 40 she drove the already warped world into chaos when she began her quest to give humanity the ability of Reality Warping to allow them into changing whatever things they can imagine under their accord. But she ascends into becoming the Big Bad of the manga in Chapters 38 to 40, mirroring her prime's past plans of West Yomogi, albeit to far more dangerous levels.
- Kill All Humans: Her main goal is to give reality the newfound powers of changing themselves, where Sis coldly warns that she goes beyond that as it would ultimately cause a feedback loop.
- Reality Warper: Shares this trait with her original, with the exception of her having the ability to allow humanity to change themselves according to their specifications via their imagination.
- The Reveal: Was created from Big Sis' clone creation ability when she used the machine language to increase the computational power of their world. However, she later becomes a self-aware entity, despite having only a part of her prime's consciousness, with her newfound plans to grant humanity the ability to change themselves, as in her own words their "best version". This caused a problematic feedback loop as it led to driving the world into chaotic insanity.
- Something Only They Would Say: Inverted. The clone mentions many things that the real Big Sis would never say, such as the revelation towards the Mosasa Dogs that they can become music in the first place, signifying her newfound interest in unlocking the Key's potential as Sis only knew about it DURING Chapter 40. She also mentions cryptic things including how the past is simply a material for the future whilst standing besides Shijima, which is also another dead giveaway as the prime never mentions anything about the state of past and present West Yomogi.
- Walking Spoiler: Her nature as a character is a walking spoiler, as it is impossible to talk about her without mentioning the origin of how she was created and her true goals to the simulation.
- Xanatos Speed Chess: When her plans of spreading the Key to humanity became known far and wide by her prime, she later comes into conflict with her. In the midst of the battle she and her clones were restrained one after the other by the prime in an attempt to stop her for good. Except that the clone was able to kickstart that plan, initially unknown to the prime Sis, beforehand by using the Mosasa Dogs' performance as a "resonance effect", where her goal of unlocking humans the power to change themselves was successfully spread across the people of the simulation, ultimately resulting with the outcome of her goals paying off at the end of the chapter.
The Visitors
Chito and Yuuri
First Appearance: Chapter 48
Strange people that Shijima encountered inside the train to nowhere and look exactly the same as her neighbours. They are revealed to be the souls of Chito and Yuuri, the original main characters of Girls' Last Tour.
- Canon Character All Along: While they are seemingly new, yet late additions to the story as a Shout-Out to its spiritual predecessor, it is revealed that they are the same Chito and Yuuri from tkmiz's previous work with their previous life consciousness transported into the simulation. This makes the manga canon to its predecessor.
- Have We Met?: When Chito asks Shijima if she met her before, the latter mistakenly thought they were neighbours from her old apartment. Unbeknownst to Shijima, she's talking to Chito and Yuuri from Girls' Last Tour and not her former neighbours.
- Last Episode, New Character: Introduced much later in the manga's penultimate chapter as a Walking Spoiler.
- Minor Major Character: Both served as the main characters of Girls' Last Tour, one of tkmiz's works, and only made an appearance in the Dénouement Episode of this manga.
- The Reveal: They are revealed to be the same characters from the author's previous work with their consciousness from their previous life transported into the simulation. It is hinted for the fact that they do not know about them being neighbours to Shijima as well as with Yuuri not having understanding of what a housing complex/danchi is, which is a takeaway as only their simulation counterparts had memories with Shijima. One of the panels of Chapter 48's page 11 is also another revelation as Shijima saw the duo in a grassy world, which is identical as to how both Chito and Yuuri ended up at the finale of Girls' Last Tour.
- Walking Spoiler: You can't talk about them without spoiling the biggest reveal of the entire manga that it was canon to Girls' Last Tour all along.
