Chaos Head
G-L G.I.R.L.: Inverted. Takumi's online friend, Grimm, who chats with him about lewd topics like whether swimsuits or glasses look better on girls, is actually an adult female nurse who was trying to shock Takumi into New Gen under the guise of friendly teasing.
Geek Physiques: Subverted. Takumi despite spending most of his time locked up in his room, playing video games and drinking Coke, is actually very skinny. However, it is played straight in how he is very out of shape when he struggles to run away from people because he runs out of breath easily.
Geek: Takumi, to an unhealthy extreme. He much prefers 2D girls to real women, and would rather not mingle with real people. Yua acts like one to get Takumi to trust her, though it's later revealed that her love for anime and manga is genuine.
Get a Hold of Yourself, Man!: Rimi slaps Takumi to get him to come to his senses in Chapter 3, when he's freaking out after witnessing an empty Shibuya and Shogun interrogating him, as well as not trusting Rimi who is trying to get him out of the street before he gets run over.
Girl with Psycho Weapon: The entire core female cast is a Dysfunction Junction, and they all come to wield DI-swords.
Go Mad from the Revelation: Sena's mother was secretly used as a test subject for creating matter from delusions artificially. Since her second child and Sena's little sister mana died shortly after birth, they created a new baby from artificial delusions and gave it to her. Sena's father was against turning her into a guinea pig, but also didn't want her to realize that her child had died, so he reluctantly approved. The experiment continued for several years, until it was decided that enough results were gathered from it and it will be halted. Sena (who didn't know about the experiment) unfortunately happened to be there when they turned the machines off, causing her mother to freak out upon realizing she's been carrying a corpse and proceeded to tear at her face, eat her child's corpse, and stab her own eyes out with a pair of scissors. All while Sena could do nothing but watch.
Government Conspiracy: The Committee of 300. They funded NOZOMI's experiments and heavily supported them them, as well as had a fair few companies and organizations working towards their aims.
Gratuitous English: "New Gen", the name given to the bizarre and gruesome string of murders. DI-sword, standing for "Delusion Ideal-sword".
Gigalomaniacs fall under this as well.
Gratuitous German: "Neidhardt Der Blischnelle", translating to "Lightning-Fast Knighthart" which is Takumi's username for ESO.
The Greatest Story Never Told: No one remembers Takumi outting Hazuki as the New Gen culprit in later entries because the footage of it was lost following the Shibuya Earthquake. Though it's possible the Committee of 300 helped obfuscate this fact afterwards to prevent ties to the Church of Divine Light being found. It also goes without saying that no one finds out about Takumi's struggles in future entries aside from the other 6 main girls, because he hasn't told anyone else. As of yet anyways...
Guide Dang It!: While the NoAH routes are pretty simple to get (you just have to check the delusion trigger choices that appear when a girl first shows up in the story and then answer some obvious questions), good luck getting Route B without a guide. You won't know that you need to pick choices that mention "Whose eyes are those eyes" in order to obtain this route.
Handsome Lech: Takumi's best and Only Friend Misumi is always bragging about the many girls he gets with, and shows interest in nearly all the girls Takumi encounters.
Harmful to Minors: Sena and her sister were essentially used as guinea pigs in the experiments done by NOZOMI.
He Knows Too Much: Suwa, one of the New Gen killers and Ban's partner, kills him in cold blood because Ban uncovered too much of the truth behind the NOZOMI conspiracy.
Healing Factor: Subverted. Gigalomaniacs can alter reality, but they can't use their powers to heal. This is why Shogun cannot heal himself and is doomed to die. Eventually, Takumi learns how to bypass this restriction which is instrumental in allowing him to destroy Noah II.
Heroic BSoD: Takumi has two during the course of the story. The first is after chapter 6, when he is tricked into believing his sister is dead. The second is after the revelation that he's an Artificial Human.
Heroic Sacrifice: Hatano Issei willingly takes a bullet for his daughter, Sena, after Suwa tries to kill the both of them. He succumbs to his wounds after.
Hope Spot: Takumi believes that Yua doesn't have any ulterior motive for talking to him and that she genuinely came into his life because she liked him and wants to help him. Sadly, this only ends up being partially true. Takumi later believes that Rimi doesn't have an ulterior motive in helping him and he ignores the warning signs that she's suspicious because he wants to be helped since he's being targeted by the New Gen killers. It doesn't last.
Hospital Hottie: Shino. Also a Meganekko, to an extent.
Hourglass Plot: Rimi spends most of the game trying to save Takumi from the Nozomi's machinations (the New Gen incidents) and keep him uninvolved in them so he won't become traumatized or killed, and she even saves him from being murdered at the hands of Sena at one point. By the end, Rimi is kidnapped and Takumi ends up being the one who has to return the favor and saves her from Nozomi's clutches.
How We Got Here: The story starts with Takumi lying in a ruined Tokyo street. A Girl summons a Sword out of thin air and kisses him just before she stabs him. The context is that he has just defeated Norose and was blasted outside by the force of his machine, which caused an earthquake that destroyed Shibuya. He begs Rimi to kill him so the real Takumi, Shogun, can live a little longer while he dies as a mere clone. Subverted in the AA ending, which reveals what actually happened is her sword wasn't Real Booted, because Rimi decided to save Takumi instead.
I Didn't Tell You Because You'd Be Unhappy: There is no good way to tell your friend that you've developed feelings for that their entire existence is a lie, and that they have fabricated memories and no home or true family. This is the reason Rimi doesn't tell Takumi the truth until he returns to what he believes is his home only to find that it doesn't exist.
The Illuminati: The Committee of 300 who have control of most of the influential corporations world wide and have incognito spies everywhere. The goal of Nozomi is to create a device that will allow them to defeat the Committee so they no longer have control of the world.
Image Song: Each heroine has her own Image Song that plays during the credits of her respective route in the Xbox 360 version.
Imaginary Friend: Seira, from Blood Tune, is this to Takumi. She is also not the best one, as she frequently encourages his unhealthy habits and retreating from reality, then insults him whenever he does begin to connect with the outside world.
Imagine Spot: Defines Takumi's 'delusions', but it seems as though he doesn't remember them. Some might go into Daydream Surprise territory, except they're obvious to the audience, particularly because you have to trigger them yourself in the game.
In-Series Nickname: Given to a few characters of the cast: Takumi: Neidhardt, Takumi-shan, Taku
Rimi: The Demon Girl, Sakihata-shan
Ayase: FES
Hazuki: Grimm
Suwa: Darth Spider
The real Nishijou Takumi: Shogun
Insane Equals Violent: While this isn't seen often in the original game, NoAH has several instances where Kozue completely loses her temper and kills/maims numerous people when her trauma with mirrors is triggered.
Internet Jerk: Takumi is a memer who can be pretty mean and arrogant on the internet, when in reality he's a passive, paranoid and quiet teen with social anxiety who rarely can get a word in edgewise in conversations.
Interrupted Suicide: Ayase. Takumi's first conscious use of his delusionary abilities in the game is to create a flowerbed which breaks her fall after she attempts suicide by jumping off the roof of the school. And later on, Takumi himself gets interrupted multiple times when he tries to off himself, once by an illusion of his sister, then by Shogun, and then Rimi herself decides not to kill him like he requested.
It Sucks to Be the Chosen One: Takumi was chosen (or rather, created) by Shogun for the sole purpose of suffering enough to awaken as a Gigalomaniac, then destroy Noah II which is a near impossible feat. His creator did give him free will so he could live a peaceful life after achieving this goal, so it's not entirely bad at least.
It's A Small Net After All: Averted- Takumi encounters random comments, spam e-mail, and useless search results in the process of finding whatever he is looking for at the time.
It's All My Fault: Takumi experiences this when he fails to save Nanami at O-Front, blaming himself for what he believes to be her murder. Somewhat lessened later when he finds out she survived, but she still lost her hand in the process and he blames himself for that regardless. Shogun blames himself for the entire crisis the Gigalomaniacs face in the present, because he created Ir2 which was manipulated by offshoot traitors of the Committee of 300 for their personal gain, which led to every Gigalomaniac involved to be tracked down and tortured for this plan.
Hatano Issei entirely blames himself for the deaths of his wife and daughter as well as Sena being traumatized for life because he willingly let his wife and daughter be used in a NOZOMI experiment.
Leaning on the Fourth Wall: Takumi often remarks on how he feels the "Gaze of God" watching him, and so do most of the other characters in the story whenever we see scenes of them where Takumi isn't present (poking fun at it being the player of the game). Takumi mentions at some points that he thinks he's in a game world due to how ridiculous the events that happen to him and the people he meets are, as well as this insane conspiracy he's trapped in. He even says that he wants the person watching him from the screen beyond to reset his level and make him a stronger, more manly character.
Whenever Takumi bonds with Rimi or Yua and they seem to be romantically interested in him, he mentions "IT'S A ROMANCE FLAG!" in his thoughts.
In the anime version, after the common eye phrase pops up, he looks directly towards the camera, as though he noticed the viewers watching him for no given explanation. This seemingly confirms that the eyes he's always referring to are the eyes of the viewer.
Lethal Chef: Subverted. In one of the NoAH routes, Nanami makes some eggs and sandwiches for Takumi and he says it tastes pretty great.
Lighter and Softer: Chaos;Head Love Chu Chu, a true Unwanted Harem romantic comedy version that's actually a sequel to the main series of events of this entry, but is free of the blood, gore, and overall horror that the original is known for. It serves as an epilogue that details what the cast is going to do with their lives after surviving the nightmare that was the original game.
Limited Wardrobe: Justified. All of the main girls are Suimei Academy students, and the story takes place in the middle of the school year, so they're required to have their student outfits on most of the time as a result of Japan Cultural norms. Rimi actually has a casual outfit she wears in scenes prior to pretending to be one of Takumi's classmates.
Little Sister Heroine: Nanami. The way the game works means that as with the other female main characters, you can trigger certain 'delusion' events about her that occur only in Takumi's head, but that he doesn't control. Several 'delusion' events play up this angle, such as with the indirect kiss scene. Of course, she is technically not his real sister, as he is a clone of the real Takumi, Shogun.
Locked Out of the Loop: Nanami has no idea that Takumi is being targeted for New Gen and just casually interacts with him thinking nothing is wrong. Even when she gets kidnapped by Nozomi and tortured she still has no idea what's going on, and only wishes for her brother to remain safe after she's rescued.
Loners Will Stay Alone: Takumi is practically the stereotype for this, complete with an obsession for online gaming, and imaginary wives. He is forced out of it, in circumstances he really does not enjoy at all.
Loophole Abuse: The finale. Takumi figures out how to bypass the No Self-Buffs limitations on Gigalomaniac powers, and is able to infinitely regenerate, allowing him to destroy Noah II and Norose, and save the world.
Lotus-Eater Machine: Noah II is exactly this, as its purpose is to create something of a delusion synchro among all of humanity that erases from sight any and all bad occurrances in the world, so everyone can live in an eternal utopia where nothing ever goes wrong, and achieve permanent peace. At the end of route B, Takumi imagines himself in a harem with the heroines. Takumi didn't escape it.
Love Confession: Takumi realizes he has feelings for Rimi at the climax of chapter 9, but doesn't tell her because he knows he will die soon, and he didn't want to hurt her. This is exactly how things end for him in A Ending, though Rimi kisses him as she stabs him to ease his pain. In the True Ending, Blue Sky, following their kiss, Takumi survives because Rimi spares him by not real booting her sword, saying that she loves him and wants to spend her life with him. Takumi reciprocates, finally confessing that he loves her too, and the two cling to each other in the rain. They then use their delusions to clear the cloudy sky, so they can finally see the blue sky they've been fighting for all this time.
Love Makes You Crazy: Yua cares so much about her sister that she goes to insane lengths to find the killer and bring them to justice to avenge her. This includes stalking Takumi for information, trying to build trust with him to get more info out of him, and building an entire case against him claiming that he has a split personality that is committing the murders.
Chaos Head
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