The story is set in an alternate Earth where phenomena, known by the generic term "Spacequakes", occur. The first of these spacequakes devastated Eurasia thirty years before the time the story takes place, claiming 150 million lives. The protagonist, an Ordinary High School Student by the name of Shido Itsuka, lives in a world where these disasters are common place. Schools regularly have drills in case of a spacequake, evacuations are done swiftly, and a group known as the JSDF disaster response team rebuilds the destroyed areas impossibly quickly. However things have gotten strange lately for Shido, the spacequakes that slowed down to a halt have suddenly appeared once again with terrifying frequency; and they all seem to be centered around where Shido lived...After a confusing series of events, Shido soon learns that all is not what it appears in the world. He discovers that the spacequakes aren't natural disasters, they are caused by beings, known as"Spirits", being forcibly sucked into this world from their own; and it also turns out that they happen to be top class Bishojo as well. He also finds out his little sister, Kotori, is a sadistic commander of a Spirit Response force, Ratatoskr, whose goal is to capture the Spirits without harming them. Unfortunately there is anothergroup called the AST (Anti-Spirit Team) who feel that simply killing them is the best solution. Shido, being the kindhearted hero he is, decides to use any alternative to save the Spirits since killing them seemed wrong (despite the fact they seem to cause mass destruction wherever ever they go). And it turns out that there is a way to save the Spirits without hurting them, the Spirits are able to lose their powers and live amongst normal people if Shido manages to... make them fall in love with him? As his sister Kotori bluntly lays it out for him, "Since it's like this, just go date her, and make the spirit fall for you!"And so yet another hero is created!Date A Live (デート・ア・ライブ) is a Japanese Light Novel series written by Tachibana Koushi(橘公司), with illustrations by Tsunako(つなこ), published by Fujimi Shobo under their Fujimi Fantasia Bunko label. The novel was first published in March 2011. Three manga adaptations were published: Date A Live (which follows the original novels, and got Cut Short), Date Ast Like (a Yuri spinoff involving Origami, with a girl from the AST called Mikie as the main character), and Date A Origami (a 4-koma which focuses on the romantic comedy aspect of the series). An anime adaptation was announced for the Spring 2013 Anime season. At the end of the last episode, a second season was announced. And here's a small trailer for the second season.The Light Novel currently consists of eight volumesnote for some reason, the word orders of the English and Japanese titles as printed on the LN covers are inconsistent:
Actually, Volume 4 implied it and Volume 5 confirmed it. It's just that Volume 7 shows him using multiple Angels at the same time, for the first time.
Alternate Universe: The setting is basically Earth, with a history of a spacequake killing 150 million people 30 years before the start of the series. Depending on when said spacequake was, it may count as Alternate History as well.
Shido learned not to kiss another girl in front of Tohka. Which makes his job of sealing Spirits all the more difficult, but better that than having Tohka gain back her powers because she's that angry. Hurting Shido in front of Tohka is even worse. See Roaring Rampage of Revenge. And Superpowered Evil Side.
BFS: Quite a few, but Tohka's weaponry seems to take the cake. During her Roaring Rampage of Revenge it gets boosted to 10 meters longnote About 3 stories.
Big Damn Heroes: Tohka, Origami, and Mana do this for Shido from time to time, such as when Mana arrives before Kurumi can do anything malicious to him in episode 8.
Efreet!Kotori saving Shido, Tohka, Origmai, Mana and a big chunk of the city from Kurumi at the end of Volume 3/episode 9. And defeating her.
Then in Volume 7 we have Miku coming to Shido's rescue when he's trapped by some Wizards while trying to rescue Tohka. And later on when Tohka loses control of herself and attacks them, Yoshino and later the Yamai twins come to help.
Tohka and Yoshino do this again in episode 12, distracting Origami long enough for Shido to seal Kotori's power.
Breather Episode: Episode 6 is original to the anime adaptation and far sillier than the rest of the series. Doubles as a Hot Springs Episode. Except they only get to the hot springs a a few minutes before the end of the episode.
Break the Cutie: Happens to Tohka and Origami when they think Shido has been killed by the latter, but special mention goes to Kurumi who went insane after being killed over and over again by Mana.
Actually, the "killed over and over" thing is Kurumi's attempt to do this to Mana. Kurumi herself was broken for the same reason Tohka would have been, being all alone in a world that hated her. Which means that all Mana and Kurumi achieved was to break each other.
Yoshino also. She created the Yoshinon personality to limit her own power so she wouldn't hurt anyone. And yet the AST still indiscriminately attack her. In fact Yoshino would easily have ended up like Kurumi if not for Yoshinon.
Poor Miku. After she refused to sleep with a TV producer, false scandals about her popped up and ruined her Idol Singer career, and her fans (over 90% of them are males) turned against her. And on top of that, she lost her voice due to all the stress. For someone whose only talent was singing, it was as if she lost everything. No wonder she hates men so much.
Can't Stay Normal: Type 2. Every volume brings a new threat that can't be thwarted without their powers.
Nerf: What happens when they do use their powers after having them sealed. Specifically, they seem to have a partially powered state where they are weaker and get a sort of partial Astral Dress. The difference being that their powers will flow back to Shido when they calm down, while if they take back all their power Shido has to kiss them again. We've only seen it with Tohka, who gets the skirt of her Astral Dress combined with her school uniform. However, Tohka duels Origami's AST squad without a problem in the low power state. Later, she gets owned by Ellen in the same mode however.
Calling Your Attacks: The Spirits have a tendency to shout out the names of their finishing moves before they use them. As if shouting out the names of their Angels every time they summon them wasn't enough already...
Casual Danger Dialog: A variation as the communicators aren't fighting. During Shido's first encounter with Tohka, they do small talk with one another as they sit in place...all while the AST are shooting at them, unable to hit thanks to a force field from Tohka.
Chick Magnet: It's Shido's job description. Ironically, he's fairly bad at it. Kotori says this when Tohka appears asks Shido to take her on the date he asked for and Kotori and Reine happen to see them together in a restaurant.
Kotori: If that was the case, then onii-chan would be going out with a normal girl. If you ask me whether that or a Spirit silentlynote It's implied that it was thought to be impossible for Spirits to appear without a spacequake appearing is more likely... then by a narrow margin it would be the latter.
Then again, considering how quickly he got Tohka to warm up to him, and what he did for Miku in Volume 7, considering that she gave him much more help than he gave her, he may actually be much more competent in this department than Kotori claims he is.
Child Soldiers: A lot of the AST members, since the AST usually takes in those whose parents are dead. Usually killed by the Spirits.
Christmas Cake: Tamae, Shido's homeroom teacher. Reine would fit also, although it doesn't seem to bother her. Ryouko, Origami's superior is also this.
Clingy Jealous Girl: Both Tohka and Origami towards Shido. Later on, the Yamai twin Spirits join in.
Subverted with Miku; while she's far clingier than the rest of the girls, she's far from being jealous. Ever. In fact, she doesn't even mind Shido having a harem.
Close-Call Haircut: Shido gets two from Tohka in their second meeting at Raizen high when she was less than satisfied with some of his answers. The walls and buildings behind him don't fare as well.
Code Name: The AST and the DEM assign these towards the Spirits. "Princess" for Tohka, "Hermit" for Yoshino, "Nightmare" for Kurumi, "Efreet" for Kotori, "Berserk" for the Yamai twins, "Diva" for Miku.
Cry Cute: Kotori after having to see Shido almost die again thanks to crossing a five meter barrier that would kill anyone approaching it. Interestingly enough, she didn't react at all the first time...note If Shido used his Healing Factor while crossing said barrier, he would be instantly frozen, so to cross the barrier to get to Yoshino he couldn't use his power, meaning he had a real chance of getting Killed Off for Real.
Yoshino after Shido manages to get through said barrier to hand her Yoshinon.
Curb-Stomp Battle: Spirits versus, well anything that's not a Spirit really. Unless it's a very powerful Wizard from the DEM who can fight as well as them, if not better. Like Ellen.
Kotori delivers one to Kurumi in episode 10. She also likely would have killed her had Shido not stopped her at the last second.
Cycle of Revenge: Spirit shows up on Earth, a huge calamity happens in a particular area. The survivor of said calamity then wants revenge to the Spirit who killed that person's parents or loved ones. Spirit (may or may not have to be the same Spirit) then gets dragged on by the revenge of said person and tries to defend herself from attacks. In case you haven't noticed, this is how Origami deals with Spirits with Tohka and Yoshino just trying to defend themselves.
Dark Horse Victory: In Volume 4/Episode 11, as part of Shido's Training from Hell, Tohka, Origami and Yoshino are to excite Shido as much possible while they select swimsuits; the one who makes his heart beat the fastest wins a date with him. Both Tohka and Origami spend much of the time trying to outdo each other, only for Yoshino (who was stuck in the changing room all this while) to win in the end.
Date Peepers: Origami follows Shido and Tohka around on their date in Volume 1/Episode 3.
Dating Sim: How the crew aboard the Fraxinus deals with the process of decision making for Shido to date the Spirits. This is even how Shido is trained by Ratatoskr to prepare himself mentally to go on dates with the Spirits.
Death Is Cheap: For Shido and for Kurumi. Also true for Kotori, whose Efreet powers are sealed inside Shido.
More of Healing Factor for Shido and Kotori, but they're treated as dead anyway before it kicks in.
Despair Event Horizon: Tohka crosses this when the former decides to try to stay in this world... and then Shido gets shot by Origami. She thinks "the world had chosen to reject her in the cruelest way possible". Thankfully, Shido turns out to still be alive. And again in Volume 7, when Ellen pierces Shido's chest in front of her, leading her to tap into her Superpowered Evil Side.
Did I Say That Out Loud: While Shido is showing Kurumi around school, three options for him pop up on the screen on the Fraxinus, one of which is asking what panties she's wearing today. Kyouhei immediately suggests that line, and then when he gives his perverted reason, Kotori has him dragged out of there, and then says that very line. Shido immediately starts to ask Kurumi that (before he realized what he just asked her), and Kotori also realizes she was broadcasting to him.
Disproportionate Retribution: The punishments Shido has to endure whenever he screws up in the training Ratatoskr gives him certainly qualify.
When Kurumi sees four random guys shooting at a helpless kitten with airsoft guns, she decides to join in on the fun, but modifies the rules slightly. When Shido finds her later, it turns out her modified rules was to shoot the men with her magical gun.
At the end of Volume 4/episode 12, Kotori asks if what Shido said to her was true earlier. He reaffirms that he loves her...as a sister, promptly her to deliver a flying kick to him in response. Earlier in the episode it also happens in some ImagineSpots Kyouhei has, where he imagines the scenarios Shido is in with Kotori where she beats him up for various things.
Excuse Plot: The plot is basically: To save the world, date girls. Yes.
Exotic Eye Designs: Anyone with Spirit powers has whitened pupils. This of course includes Spirits themselves. Kurumi seems to be an exception at first, but when she uses Spirit powers it sometimes shows (albeit not in her left clock eye). The original Kurumi also has the white pupil all the time.
Eye Scream: Mana does this to Kurumi in the beginning of episode 9 of the anime, as evidenced by the reflection in her eye before getting stabbed.
Fanservice: The illustrations in each volume of the light novels include one depicting the Spirit(s) on the volume cover with their Astral Dresses taken off, leaving them only with underwear (if any).
The 5th novel stands out to the point that you think someone got told to ramp it up a bit. It takes place on a school trip to the beach and features the Stripperiffic Yamai twins trying to seduce Shido. So there is far more of this than the other volumes
First Kiss: At the end of the first volume no less. Though it was true only for Tohka and not Shido, who had sealed Kotori's powers via the same way five years prior.
Food As Bribe: When Reine tells Shido in episode 12 that Kotori's feelings for him were already at max level, Kotori claims it must have been a fluke. When Reine tries to clarify that it isn't, Kotori then points at her and mentions a dessert. Reine immediately claims the numbers must have been an error.
Friendly Tickle Torture: When Kotori (wearing white ribbons) violently wakes up Shido, he says that if he doesn't get another ten minutes of sleep, he'll be infected by a virus which will cause him to tickle her uncontrollably (also known as theT-Virus). He then puts on a scary face, causing her to run out of the room.
Gory Discretion Shot: Used a fair bit in the anime, which seems to target a younger demographic than the light novels. While not a particularly violent series, basically nothing is shown. Blood splatters are basically it. The blood is redat least.
Shido getting shot is basically a Freeze-Frame Bonus to even see his body falling, and he appears unhurt on the ground (after getting shot with the equivalent of an anti-tank round). Similarly, Shido appears unharmed after passing through Yoshino's "barrage of shotgun shells" barrier; in the novel, he was unrecognizable until the Healing Factor kicked in.
Kurumi gets led into an alleyway by three thugs (more like sheled them in, though) and... we see a truck run over a can of tomato juice. Similarly, when Mana kills Kurumi, the entire scene is covered in heavy shadows (and she wearsred and black) so nothing is really visible before the camera cuts to a reaction shot of Shido watching.
Go Through Me: Shido does this in Volume 4/Episode 10 in an attempt to stop Kotori from blasting Kurumi into oblivion. She regains her sanity at the last second and just barely adjusts her aim to avoid hitting him.
He does it again in Episode 12, this time to prevent Origami from shooting Kotori.
Hair Decorations: A number of them (Kotori, Tohka, Origami, Kurumi, Miku), but special mention goes to Kotori, whose personality depends on the colour of her ribbons.
Harem Seeker: Shido is an unwilling one, since Ratatoskr pretty much forced the job on him. Naturally, the harem he gets as a result is just as unwanted.
To be fair, Shido originally thought Tohka was the only Spirit. And even then he wasn't too big on the idea of having to date her.
Healing Factor: As put by Kotori, Shido is starting a New Game+ thanks to his healing factor. This is because he kissed Kotori back when they were kids and her powers are currently sealed within Shido.
Hot Springs Episode: In Volume 5. However, the twist is that Origamitries peeking at the boys' side while the rest of the boys (Shido's at the girls side, long story) try peeking at the girls side.
Episode 6 of the anime, though the bulk of it consists of the trip to the hot springs rather than the hot springs itself.
I Am Your Opponent: Tohka declares to Origami that she'll keep her busy while Shido attempts to reach out to Yoshino.
If You Kill Him, You Will Be Just Like Him: Shido pleads for Origami not to kill Kotori in Volume 4/Episode 12, despite the latter's anger and bloodlust to kill the spirit she believes was responsible for killing her parents. He eventually manages to talk her out of it.
Kotori: If we want a solution to the spacequakes without using force, then we have to persuade the Spirit right?
Shido: That seems right.
Kotori: For that, wouldn't it be quickest to make the Spirit come to like this world? Oh, this world is so wonderful~, if they become like that, then even a Spirit wouldn't randomly go on a rampage.
Shido: I see.
Kotori: Thus, well, isn't it often said? That if you fall in love then the entire world seems beautiful. —And so, date her, and make the Spirit fall for you!
Shido: No, there's something wrong with that logic.
The Dating Sims that Kotori makes Shido play are also full of this. This is one of the reasons why it counts as Training from Hell for him (the other being the punishments for failing).
Is It Something You Eat?: In Episode 7 of Season 1 of the anime, Mana and Kotori are having an argument about Shido. They mention various things, which confuses Tohka and Yoshino. They think the two girls are talking about rice, and Yoshinon then mentions something about mixing the two together in a bowl to eat, and Tohka innocently asks Shido to put Kotori and Mana together. He immediately asks if she's trying to make him into a criminal.
Laser-Guided Amnesia: Endemic to the setting, with Shido and Kotori having significant holes in their past memories. Notably, the entity that gave Kotori her Efreet powers, Phantom, then proceeded to strip Shido and Kotori of their memories. While Kotori forgot only about the existence of said entity; Shido forgot a lot more. All the Spirits (that weren't known to be originally humans, anyway) have no memories of before that time and seem to have lost variable amounts of basic knowledge. Tohka seems to be the hardest hit, as she even lost her name, creating a lot of Fish out of Water situations (she didn't know what a (animal) fish was either, or that they swim, for that matter. She thought they were only food and an aquarium was a restaurant).
Marshmallow Hell: Reine does this to Shido in episode 10 to calm him down when he starts freaking out and asking a lot of questions about what happened in the last day or so.
Mega Corp.: Deus Ex Machina (DEM) Industries, a corporation based in England, and the company that makes the Realizers. In Volume 5 DEM's managing director (Westcott) gets Origami's punishment for borrowing a prototype without permission changed from "dishonorable discharge" to "2 months house arrest", which seems to mean she is basically taken of active duty and given a vacation. They also get the school's field trip changed to a small, isolated island as part of their plan to kidnap Tohka.
Asgard Electronics, the company backing Ratatoskr may also fit here. It's implied that they were able to come up with fairly strong backgrounds for the sealed Spirits at least.
Meido: Origami dresses as one when Shido goes to her house because she overheard him saying that maid costumes are better than nurse costumes. Also, we see quite a lot of them in Volume 6-7. Including a maid café.
Mildly Military: The AST seem to function like this. They seem to be able to have a normal life outside of their military duties, and always seem to act independently from other military forces.
Mood Whiplash: The anime opens with a space quake devastating central Asia, killing 150 million people. Then it cuts to the Panty Shot-lined wakeup call that Shido has to endure when Kotori has a hyper morning.
The series as whole seems to use this a lot. Shido's highly silly first date with Tohka ends with her deciding to stay in this world followed by him getting shot. In Volume 3 the very silly triple date sequence is interrupted by Kurumi shooting some people in an alley and then getting brutally murdered by Mana. Of course, Death Is Cheap for Kurumi, but...
The first half of episode 10 is a brutal fight between Efreet and Kurumi, followed by some exposition for Kotori. Then the last third or so of the episode is filled with Origami attempting to seduce Shido at the hospital, followed shortly by her revelation that her parents died in a fire which she blames on Efreet, who Shido just learned is Kotori.
Non-Lethal Warfare: AST vs Spirits. Justified in that the Spirits are Nigh Invulnerable, so they don't feel all that threatened and so don't fight back seriously either. Medical Realizers heal most injuries that happen fairly quickly (Origami mentions getting a broken arm healed overnight) This removes most of the consequences of the Child Soldiers. The AST members seem to be generally sane and well adjusted, or at least, their issues don't come from fighting.
Taken Up to Eleven in episode6. Again, justified since Ratatoskr's intention was only to stall the AST, not kill them.
The Nudifier: Spirits' clothing (Astral Dress) are part of their powers. So if those powers are sealed..... This may be one of the few cases where this is Played for Drama rather than comedy or Fanservice, at least for some cases.
Older Than They Look: Reine looks really young for someone who's been more than 30 years old. Then again, her most noticeable features would be her baggy and sleepy eyes.
Tamae as well, leading her students to call her Tama-chan.
Ominous Latin Chanting: Used to good effect in the anime. Often associated with Tohka's Spirit powers. And Kotori's.
Omniscient Council of Vagueness: The Ratatoskr organization has one though we don't get to see their faces because Kotori set it up that way, listening via audio feed.
Parental Abandonment: Origami's parents were killed in a fire caused by a Spirit and Shido's mother (and by extension, Mana's) abandoned him for unknown reasons. He's currently adopted by the Itsuka's, in which both parents are currently abroad.
Rent-a-Zilla: Yoshino's Angel (Zadkiel) got a Kaijuupgrade in it's second appearance in the anime, complete with Dutch Angle as it lifts it's head above the surrounding buildings.
Rescue Arc: Volume 7 has Shido trying to save Tohka from the clutches of the DEM.
The Reveal: At the end of Volume 3/episode 9, where Kotori shows up as a Spirit, and canceled out a spacequake Kurumi attempted to cause.
At the end of episode 11, Origami sees Kotori as Efreet in some video footage shot during the battle with Kurumi.
Right Behind Me: In episode 8 of the anime, after Shido asks Kurumi out on a date, he has a Flash Back of being told by Kotori to ask her out. So he promises to make Kurumi fall in love with him, only for Origami to show up behind him and ask what he's talking about. The light novel has the same scene without the flashback.
Selective Obliviousness: Shido claims he passed out shortly after Origami did in episode 10 while visiting her at the hospital. She then tells him that her parents died in a fire five years earlier caused by one of the spirits, which was also why she's a member of the AST and so intent on killing spirits. He just found out moments earlier that Kotori was a fire-based spirit, but chose not to say anything about it, particularly after her reveal.
Sequel Hook: At the end of Episode 12 of Season 1, Tohka asks Shido for a kiss. Although they're being spied on by the Ratatoskr, he follows through with it...only to end up kissing Yoshinon instead, who then, along with Yoshino, says "to be continued...sometime." Right after that, Season 2 was announced.
Serious Business: Ratatoskr takes Shido's dates with girls very seriously. Since it's to save the world...
Shout-Out: When Kotori tries to wake Shido up, he tries to get her to go away by saying that he has the "unless you let me sleep for another ten minutes, I'm going to tickle you virus. Otherwise known as the T-Virus."
In the anime the first spacequake alarm has small buildings, trains and the like retracting into the ground for the obvious Neon Genesis Evangelion reference.
The poses Shido and Tohka make during their first encounter seems familiar.
Spell My Name with an S: For some reason the manga (both the main and the spinoffs) like to spell Origami's family name as Tobiiti instead of Tobiichi. Also Kannazuki/Kannaduki.
Depending on the source, the name of one of the spinoff manga may either be Date AST Like or Date A Strike. Or even Date A Stlike.
Shido does it in episode 8 of the anime when he sees Tohka running outside looking for him while he's on a date with Origami. (And Tohka. And Kurumi.)
Split Personality: Kotori has one although it's more of her switching personalities more than anything else really. The best way to figure it out would be that she would be the nice little sister with her white ribbons, while she would be the sadistic commander if she's wearing her black ribbons.She has a third one when her 'Efreet' Spirit powers return. Yoshino has one as well (her puppet Yoshinon is the outspoken fellow while Yoshino herself is a shy girl).
Strike Me Down with All of Your Hatred: Played straight but it's Shido who invokes this towards Origami. He then tells her that since she thinks it's Efreet who killed her parents, and that Shido currently has Efreet's powers thanks to him sealing Kotori, he goads her into killing him if that's what it takes to satisfy Origami's revenge. Origami doesn't go through with it.
Take a Third Option: Shido is coerced into doing this when he learns that its the only option the humans have against Spirits, aside from shooting them or letting them kill more people by accident. In Volume 5, this is also what he does to the Yamai twins by letting them both live on, instead of just one of them.
Also what Origami tried against the blizzard dome Yoshino set up. It would have worked if not for Tohka's intervention.
During his date with Kotori in episode 11, all of the options he's given seems to go bad, and Kotori doesn't seem like she's having too much fun. So he then decides to throw away the earpiece used to communicate with the Ratatoskr, and instead just takes her out to an amusement park, which seems to work a lot better.
Talking Is a Free Action: During the Dating Sim choices Kotori gives her crew just 5 seconds to make their decisions, but after that the time taken for the crew to explain their choices and for Kotori to relay to Shido which option to choose both count.
Three Timer Date: Thanks to Shido unable to say "no" to Tohka and Origami, he's going to have to date them plus Kurumi in Volume 3.
Happens to a random guy who was torturing a small kitten. Kurumi sees four men shooting at the kitten with airsoft guns, and she repays the favor to them by blasting them with a real gun. Shown more clearly in the anime, where the camera pans behind the unfortunate victim as she blasts holes in him.
Trailers Always Spoil: The anime opening shows the first 3 Spirits, and there are also previews for each main girl. Both spoil Kurumi's left eye, which is a big hint as to what her powers are.
Training from Hell: An unusual variation but still played straight in that Shido gets subjected to this by the Ratatoskr crew. If he makes a wrong choice whenever he goes to a date with a Spirit, well, see Butt Monkey up above.
Well-Intentioned Extremist: The AST. Kurumi also; the reason she killed over 10000 people was to accumulate enough power so that she could go back 30 years in time to kill the first Spirit that caused the spacequake 30 years ago.
Wham Episode: Episode 3, when Origami takes a shot at Tohka, but Shido pushes her out of the way, just in time to get shot instead. What was supposed to be a light-hearted episode suddenly does a Mood Whiplash at that moment. Actually subverted because he gets better due to his Healing Factor.
The Kurumi arc plays this straighter since she's the first Spirit whose powers he fails to seal.
Yoshino as well, but in a lighter shade. A rare subversion in the Shido admits it's a color that is "impossible to grow naturally".
Miku too, but in an even lighter shade.
Your Days Are Numbered: Mana only has 10 years left to live after undergoing a procedure to strengthen her body enough to fight on par with Spirits. She's also not the only one to have undergone the procedure.
You Killed My Parents: Origami says this to Kotori while she's in her spirit form Efreeth in episode 12. Which turns out to be The Reveal as well, since it causes Kotori to back off long enough for Origami to take flight again and activate her weapons again. Only, Kotori was not the Spirit that killed Origami's parents...
Your Princess Is in Another Castle: It's revealed at the end of Volume 7 that she was trying to find the Second Spirit, who was supposedly imprisoned by the DEM, and was the only one who knew where the First Spirit (her actual target) was. She offered help to Shido in the hopes of finding the Second Spirit in the place where Tohka was imprisoned, but the Second Spirit was actually imprisoned elsewhere. At least she got a pat on the head from Shido.
Zettai Ryouiki: Kotori wears Grade S! Except for her Spirit form, sadly.
Some girls in Shido's school (including Tohka) wear Grade A. Even Origami who doesn't, wears one in her Meido uniform when Shido visits her house.
Some Spirits' Astral Dresses include this. Tohka and Kurumi wear this under their dresses, and the Yamai twins wear them too.