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Summer Time Rendering (サマータイムレンダ in Japanese) is a shonen manga by Yasuki Tanaka. It was serialized online in Shonen Jump+ from October 2017 to February 2021, and compiled into 13 volumes. An anime adaptation by OLM Incorporated was released as part of the Spring 2022 anime lineup.

Shinpei Ajiro returns to his hometown on the island of Hitogashima to attend the funeral of his childhood friend, Ushio Kofune.

She was thought to have drowned while saving a child from being swept away at sea, but it's not long before evidence surfaces that her death was no accident. Furthermore, it may have been connected to the "Shadow Sickness", a local legend regarding mysterious entities that can steal your identity, murder you, and take your place. It all sounds like a bad joke to Shinpei — until Ushio's sister is held at gunpoint by a clone of herself, right before his very eyes. It puts a bullet in her head, then turns the gun on him and pulls the trigger.

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Shinpei immediately wakes up in a cold sweat while on the ferry headed to his hometown on the island of Hitogashima, on his way to attend the funeral of his childhood friend, Ushio Kofune.

The story starts off as a supernatural mystery where the cast unravels the truth behind Ushio's death and learns the hard way who can and cannot be trusted. As the true nature of the threat lurking the island is revealed, the stakes ramp up until the story evolves into a fast paced, Action Horror thriller that requires our heroes to employ more drastic measures in order to outwit the enemy and stay alive.

The series has a short Spin-Off manga, Summertime Rendering 2026: The Room that Dreams of Murder, focused on Nagumo/Hizuru and her niece as they happen upon a haunted apartment. The Light Novel Summertime Rendering 2026: Nagumo Ryuunosuke's 100 Views is a direct continuation which follows the two of them as they solve supernatural mysteries around Tokyo.

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A visual novel adaptation of the main series, Summer Time Rendering: Another Horizon, is slated for a January 2023 release on the PlayStation 4 and Nintendo Switch.


Summer Time Rendering contains examples of:

  • 11th-Hour Ranger: A good version of Haine, the one that Hizuru befriended in her youth, joins the Ushio and Shinpei in the final fight against Shide in Tokoyo the Eternal World.
  • Abandoned Hospital: The old abandoned clinic owned by Sou's dad is a suspicious, run down building where several plot important events take place. Hizuru first met Haine here 14 years ago, Ushio and her shadow encountered a stray shadow here two days before her death, and Shinpei, Sou, and Shadow Ushio discover an entrance to a locked secret passageway behind a creepy headless statue in the operating room.
  • Action Girl: Ushio and Nagumo at least when Ryuunosuke is in control most definitely. Shadow Mio as well and even Tokiko to an extent.
  • Adaptation Expansion: The final episode adds more meat to the manga's epilogue by including multiple scenes featuring various characters and their lives in a timeline free from the shadows' influence, as well as expanding on the reconciliation between Shinpei and Ushio after they had refused to talk to each other for two whole years.
  • A Day in the Limelight: The start of the fourth loop follows Hizuru's point of view on the morning of July 22nd and spends a good amount of time revealing what she was up to during Ushio's funeral. Thanks to her prior experience with shadows, she too suspects that Ushio's death was no accident and is able to come up with a plan to eliminate Shadow Alan before it can murder Alan.
  • Affectionate Nickname: Both Mio and Shadow Mio refer to Shinpei by "Shin-chan".
  • The Atoner: Both Tokiko and Dr. Hishigata after they each learn what Shide's real goal is and that he'll betray them as they'd only went along with it thinking they were protecting their loved ones.
  • Big Bad: Hiruko is the progenitor of all shadows on the island and her existence is ultimately responsible for every shadow related misfortune that occurs in the story. Shidehiko takes her place in this role once his intention to use the power of her eye to destroy the world is revealed.
  • Book Ends: The story begins with Shinpei returning to Hitogashima to attend Ushio's funeral. The final chapter has Shinpei returning to the island to see Ushio, who is now alive, again.
  • Central Theme: What is the difference between the original and a perfect copy?
  • Chekhov's Armoury: A lot of things that wind up having great importance later on can be easily missed the first time around.
    • During the third loop, Shadow Shinpei grabs Shinpei's cell phone and erases it for no discernible reason. It isn't until much later that we learn that shadow copies of devices that run on electricity only become fully functional if the original is erased. In the eighth loop, the shadows Haine absorbed and brought with her from the third loop allow her to not only transform into Shadow Shinpei but also have a functional copy of his cell phone at her disposal even though the original cell phone still exists in this timeline. She then proceeds to use his voice and the phone to trick the cast into splitting up so that Shide can have an easier time picking them off.
    • Sou finds a bottle of mercuric chloride while investigating the abandoned clinic, noting that it was used to treat syphilis before it was discovered to be extremely toxic. Shinpei secretly pockets the bottle and ends up ingesting its contents as a last resort method to escape the fourth loop via suicide.
    • In the same clinic, Shadow Ushio finds a very old photo album belonging to the Hishigata family. It's later revealed that someone who strongly resembles Karakiri is standing in one of the photos, providing further proof that he is Shide's true identity.
    • Shadow Ushio demands to be bought takoyaki at the festival in exchange for using her powers to slip inside a crack in the abandoned clinic's wall, and Shinpei promises to buy her 10 or 100 pieces. Ushio and Shinpei remembering this exact conversation is the trigger that causes their memories of the entire adventure to come flooding back to them at the very end of the story.
    • While exploring Hiruko Cave, Shinpei deduces from the abundance of sea water present that an escape route that leads out into the ocean has to exist. He ends up utilizing it in the ninth loop as part of his plan to retrieve that timeline's version of Shadow Ushio and launch a swift assault on Haine's main body.
    • In the fifth loop, Shadow Ushio tries to convert Nezu's two nail guns into shadow copies in order to supply them with infinite ammo, but because her memory banks are full she can only convert one of them. The normal nail gun becomes the key to taking down Haine in the final loop's cave battle. She falls for an ambush because she is unable to sense the presence of either the nail gun or its wielder Sou, since neither of them are made of shadows.
    • The mud that makes up Shide's armor is able to completely hide the wearer's presence, so when Shadow Ushio tries to reveal his true identity in the fifth loop her scan turns up blank. Realizing that something similar might work on the tracking brand on his arm, Shinpei is able to keep his location from Haine a secret in the ninth loop by hiding inside one of Tokiko's stray shadow minions.
    • Shadow Ushio suggests trying to stop the festival by stealing all the fireworks and using them to blow up the festival grounds. That plan is shot down because it would achieve nothing but cause mass panic among the civilians. Guess what Shinpei uses to destroy the massive shadow barrier that was erected to protect Hiruko's inner sanctum in the final loop.
    • Mio collects several strands of the original Ushio's hair for Shadow Ushio so she can use its data to restore some of the damage done to her body. When Shide inflicts massive damage on Shadow Ushio during the final battle, she reveals that she still has several of the strands left and uses them to regenerate enough of herself to deal a decisive blow to Hiruko.
  • Chekhov's Gift: Ushio visited Shinpei in the first chapter (July 22nd) and gave him Haine's eye, starting the time loop.
  • Closed Circle: The setting is an island 4km away from the mainland, with only a ferry responsible for bringing and returning people from the island. As Hizuru notices, the boat operatives are already Shadows themselves, and considering that now the Shadows know they have opponents, if any of the heroes try to leave, they're likely to be killed on the trip.
  • Closet Gay: It is strongly implied that Tokiko has feelings for Mio, but she is never able to muster up the courage to tell her directly.
  • Cowardly Lion: Totsumura is just about the textbook definition of this. While normally cynical and cowardly, when push comes to shove, he's able to step up.
  • Dead Person Conversation: The story begins with Shinpei talking to Ushio in a dream. He's headed to her funeral.
  • Defector from Decadence: Ushio who, despite being a shadow, is firmly on the side of the heroes and is the series' co-protagonist.
  • Earn Your Happy Ending: Shinpei goes through multiple loops and deaths before he's able to erase Hiruko, and ultimately prevent all the events of the story from ever happening, including preventing Ushio's death.
  • Everybody Lives: In the ending, a new world where Shadows never existed is born, which saves all major characters from their deaths, including Ushio, Shinpei's Parents and Ryuunosuke, who are alive and well in the present time. Haine is also re-incarnated into Ryuunosuke's young daughter and a good friend to Shiori. Shidehiko, no longer being a shadow, is implied to have lived and died like a normal person, with his descendants still watching over the temple.
  • Evil Doppelgänger: A shadow has the power to turn into a perfect clone of a human right down to their DNA, memories, feelings, and personality. But when it isn't busy impersonating the original, a shadow will tend to have a more cynical and resentful personality reflecting any negative emotions the original may have been suppressing. These shadows are also ruthless, borderline sadistic killers who show no remorse towards harming anyone who gets in between them and their targets, including friends and loved ones their original would give their lives for.
  • Extremely Short Timespan: The manga takes place between the 22nd and 24th of July, in the span of these 3 days a lot of stuff happens, granted, that days repeat due to the time loop. The night of 22nd in particular takes place over the course of roughly 20 chapters, which Shinpei lampshades to be a night that seemed to never end.
  • Flash Sideways: During the festival on July 24th, Shinpei is the only one who notices Ushio walking through the crowd in a pink yukata despite the fact that she should be dead. He chases after her, only to instead run into her shadow dressed in the swimsuit she died in. What he had caught a glimpse of was a vision of the real Ushio from an alternate timeline where she never died because shadows do not exist there.
  • Funetik Aksent: Most of the townsfolk talk in the Kansai regional accent, which translates to a phonetic drawl that brings to mind Steinbeck's dialect style at times.
  • Grandfather Paradox: Shadow Ushio is transported back to the past where she erases the whale form of Hiruko before it could copy and devour Haine. This causes Ryuunosuke, Hiruko, Haine, and eventually Shadow Ushio to disappear since they were all created from shadows that no longer exist. Meaning there is now nobody capable of going back in time to erase the whale in the first place, thus creating the paradox.
  • "Groundhog Day" Loop: A variant. Each time Shinpei dies, his start point moves forward by a certain amount of time, ranging from a couple of minutes for the first few loops to several hours for the later ones. This means that anything that occurred before the start of each new loop, such as sustained injuries or the deaths of anyone aside from him, will be rendered irreversible.
  • Heel–Face Turn: Tokiko on the fifth loop after she learns the truth about what the shadows will do to both her family and Mio. Shadow Mio as well after Ushio cuts her off from Haine's influence in the aftermath of the gym battle.
  • I Want My Beloved to Be Happy: Tokiko fully supports and encourages Mio in her attempts to tell Shinpei her feelings, despite being in love with Mio herself.
  • Kill and Replace: The life cycle of a shadow is as follows: Copy a human, kill and consume them within seven days, live out the human's entire life like nothing happened, pretend to "die" with the assistance of the Hishigata Clinic, find a new target, rinse and repeat.
  • Last Stand: Nezu and Tokiko both do this in the final loop. They manage to survive, however.
  • Legacy Character: In a sense. Ushio died before the start of the series and the Ushio we follow for 99% of it is her Shadow.
  • Living Shadow: The 2D shadow cast beneath a clone's feet is the shadow's true body, and it will move out of the way independently of its clone if anyone tries to step on it. While injuries sustained by the clone body can be healed in a matter of seconds, any damage done to the shadow itself is irreversible, including fatal damage.
  • Masquerade: To the residents of the island, shadowy clones murdering you and taking your place is nothing more than a local myth called the "Shadow Sickness". The Hishigata Clinic has been enforcing this secret for generations by fabricating the victims' causes of death, diagnosing witnesses with Capgras Syndrome, and disposing of people who try to poke their noses in too deep.
  • Meaningful Name: The four armed shadow, Shide. As Hizuru mentions, it is written in a similar way to "4 arms" ("Shi" is a pronunciation for the kanji for four, 四; "de" is a pronunciation for the kanji for arm, 手)
  • Missing Mom: Ushio and Mio's mother died shortly after the latter was born, meaning that Alain raised them (and later Shinpei) as a single parent for most of their lives.
  • No Communities Were Harmed: Hitogashima, Wakayama City, Wakayama Prefecture is a stand-in for the real life uninhabited island Tomogoshima.
  • No Ontological Inertia:
    • Any object created by a shadow will cease to exist if its creator either dies or moves at least 50 meters away from it. This does not seem to apply to any "children" spawned by a shadow.
    • Haine is the mother of every single shadow on the island. If she is ever fully destroyed, all the shadows will disappear along with her.
  • Panty Shot: A plot-relevant case, where Mio's bike crash to meet Shinpei in the docks ends up giving the latter a full view before she hits the water. When he gets thrown into his first loop and thinks he's simply suffering a bad nightmare and some Déjà Vu, it's seeing this exact scene with the exact same panties that gives him one of the major clues to what's really happened. It also becomes relevant not long thereafter because the Mio shadow that's trying to kill them is wearing white, whereas the docks scene established the real one's wearing stripes that day.
  • Parental Abandonment: Shinpei's parents died in an accident, which was why he was adopted into Ushio's family. In reality, they were killed by Shide when they discovered the shadows during a dive. Shinpei erasing Hiruko in the past retroactively prevents their deaths as well as they are alive in the epilogue.
  • Photographic Memory: Almost literally in the case of shadows. Though shadows no longer exist in the new timeline, the now teenage reborn Haine has an eidetic memory.
  • Public Secret Message: In order to keep her whereabouts and identity a secret from the shadows, Hizuru encrypts her contact info with a code that can only be deciphered using her real name and her pen name. At that point in time only she and Nezu know that she has a pen name, so by Hizuru's logic the only other person who could crack the code should be the time traveler she is searching for.
  • Once More, with Clarity!: The first chapter opens with Shinpei dreaming of Ushio, who gives him a gift before telling him to protect Mio. The second-to-last chapter reveals this was actually the future shadow Ushio invoking a Stable Time Loop by giving Shinpei Haine's eye, the item needed for Shinpei to be able to erase Hiruko before she ultimately disappears.
  • Ominous Visual Glitch: Thought your picture was still loading in? Nope, the manga has graphical glitches in many of the panels taken directly from Shinpei's perspective.
  • Race Against the Clock: At 9:00 pm on July 24th, the shadows will invoke a mass murder ritual that consumes every single human on the island. Shinpei only has three days and a limited number of retries to figure out who or what is behind this scheme and how to stop them.
  • Reincarnation: In the new timeline at the end of the series, Haine is reborn as Ryuunosuke's daughter.
  • Shout-Out: To Final Fantasy VII. Winds up being thematically relevant immediately afterwards when it's revealed that Hiruko and Shide are very similar to JENOVA and Sephiroth in origin and motivation respectively as well as the fact that Ushio is killed in a very similar manner to Aerith.
  • Stable Time Loop: In the penultimate chapter, Ushio goes back in time before she disappears as a consequence of erasing Hiruko to give Shinpei Haine's eye to give Shinpei the means to reach the conclusion needed to end the loops.
  • The Strategist: Largely Shinpei though Nagumo and Tokiko as well.
  • Summon Magic: Tokiko fights by summoning two giant wild shadows named Ros and Guil that obey her commands.
  • Teleportation Rescue: Each time Shinpei dies only his consciousness will return to the past, but Shadow Ushio will physically follow him back in time as long as she wasn't killed in the previous loop. In order to escape their captors Shide and Haine in the fourth loop, Shinpei drinks an entire bottle of poison, grabs ahold of Shadow Ushio with his consciousness once he finally succumbs to it, and pulls her into the time warp just in time to avoid an incoming fatal strike from Shide's blade.
  • The Unreveal: As a result of Shinpei traveling back to the starting point after being murdered twice, we are never shown who asked the innkeeper for the whereabouts of "the lady with the huge honkers" in the first loop. But piecing all the hints from the first three loops together will reveal that it was the Shadow Shinpei created at the funeral by Shadow Shiori.
  • Title Drop: "Summer Time Rendering" becomes the title of Hizuru's new novel idea, directly inspired by Shinpei and Ushio's recollections of the loops and the shadows via dreams.
  • Tomato in the Mirror: Ushio, has two. First there's the reveal that she's really Ushio's shadow which comes fairly early. The second, and far bigger one, is her slow realization that she's actually the part of Hiruko that was split off fourteen years prior.
  • The Very Definitely Final Dungeon:
    • The first part of the final fight takes place in Hiruko's Cave, a large underground cave connected to the sea, populated by Shadows, como of which take the form of sea life living outside water, with a shrine-like area where a major antagonist lays.
    • The actual final fight takes place on an alternate world where time stands still, disabling Shinpei's loop power and Ryuunosuke's future vision. The place looks like Haine's village and even reenacts the air raids she suffered in life.
  • Villainous Legacy: The Hishigata family has been serving Haine for generations, and their first member and clinic founder, Shidehiko Hishigata, was the first Shadow she created, currently acting as Shide.
  • Whole Episode Flashback: Episode 9 covers the story of the day Ushio met and befriended her shadow as well as the day that Ushio and Shiori were killed by Haine.
  • You Have Outlived Your Usefulness: Done by Shide to Tokiko in multiple loops. Realizing that this is their inevitable fate and that Shide's been lying to them is what causes both her and her father to join Shinpei.
  • You Killed My Father: Shinpei's parents were killed after they discovered the shadows during a marine research dive.

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