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A second-year student at Suimei Academy. He is withdrawn and not interested in the 3D world and its inhabitants. He avoids conversations with others whenever possible and only attends school in order to fulfill the minimum attendance requirement for graduation. His interests lie in watching anime, p... read more

A second-year student at Suimei Academy. He is withdrawn and not interested in the 3D world and its inhabitants. He avoids conversations with others whenever possible and only attends school in order to fulfill the minimum attendance requirement for graduation. His interests lie in watching anime, playing eroge, and Empire Sweeper Online, an MMORPG where he's the top player "Neidhardt". He suffers from intense delusions as a result of his apparent schizophrenia and the extremely secluded lifestyle he lives as a shut-in.

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A third-year student at Suimei Academy. Takumi first encounters her at school but quickly excuses himself after facing her ominous glare. She is often seen standing around Shibuya holding a very long sword and eating a light blue ice pop.

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A second-year Suimei Academy student by day and a vocalist by night. She sings under the stage name "FES" for a popular indie rock band named "Phantasm". The lyrics in her songs appear to describe the events of the recent murders in Shibuya, leading the police to see her as a potential suspect. She ... read more

A second-year Suimei Academy student by day and a vocalist by night. She sings under the stage name "FES" for a popular indie rock band named "Phantasm". The lyrics in her songs appear to describe the events of the recent murders in Shibuya, leading the police to see her as a potential suspect. She is also the most spiritual and eccentric of the main characters. Chaos;Head Noah:

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A third-year student at Suimei Academy. Takumi initially believes her to be a stalker but quickly befriends her after discovering that she's a fellow otaku. Chaos;Head Noah Spoilers:

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Takumi's younger sister and a first-year at Suimei Academy. She often puts up a strong front and argues with her brother whenever they meet but she is actually really concerned about him.

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A second-year student that transfers into Suimei Academy early on in the story. She is not shown to be speaking but appears to have telepathic abilities. She calls herself Kozu-pii. Chaos;Head Love Chu Chu:

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A mysterious pink-haired girl that claims to be Takumi's classmate and friend. Takumi, however, has no memory of her, and the circumstances in which he meets her make it even harder for him to trust her.

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A detective for the Tokyo Metropolitan Police Department Criminal Investigation Division. He's investigating the New Generation murders along with his partner Suwa. He's friends with Momose.

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Takumi's online friend, who talks to him almost everyday through their mutual favorite online game. He often encourages Takumi to have more courage while dealing with the "third dimension", and supports him throughout his many ordeals. He is very i... read more

Takumi's online friend, who talks to him almost everyday through their mutual favorite online game. He often encourages Takumi to have more courage while dealing with the "third dimension", and supports him throughout his many ordeals. He is very interested in the New Generation incidents and frequently updates Takumi with gory details regarding the murders. As his interests in anime, manga, and games are very similar to Takumi's, the two get along very well.

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A nurse that assists Takumi's doctor.

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Yua's twin sister that died in the Group Diving case. Mia was the polar opposite of Mia, being an extremely poor student, and an outright delinquent. This caused pretty strong favoritism towards Yua. Chaos;Head Noah Spoilers:

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Takumi's only friend in class. Unlike Takumi, he's assertive and a womanizer.

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President of "Trustworthiness Investigation Company Freesia." Chaos;Child: Chaos;Head Noah:

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He is the president of Nozomi Technology. Chaos;Head:

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The main heroine of "Blood Tune: The Animation" and also Takumi's favorite anime character. She is also the older sister of the character Erin-Fray Orgel, another extremely popular heroine from "... read more

The main heroine of "Blood Tune: The Animation" and also Takumi's favorite anime character. She is also the older sister of the character Erin-Fray Orgel, another extremely popular heroine from "Blood Tune".

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Shogun is a mysterious person that Takumi meets during a chatting session. He sends gore pictures relating to the New Generation incident to Takumi, the equation "fun^10xint^40=Ir2", and the phrase "Whose eyes are those eyes?", which Takumi often used. This event gives Takumi paranoia throughout the... read more

Shogun is a mysterious person that Takumi meets during a chatting session. He sends gore pictures relating to the New Generation incident to Takumi, the equation "fun^10xint^40=Ir2", and the phrase "Whose eyes are those eyes?", which Takumi often used. This event gives Takumi paranoia throughout the story, thinking that Shogun is spying on him and trying to kill him.

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A detective for the Tokyo Metropolitan Police Department Criminal Investigation Division. He is Ban's junior, and Ban considers him to be both an underling and a friend. His hobby is watching movies, especially Spark Wars. read more

A detective for the Tokyo Metropolitan Police Department Criminal Investigation Division. He is Ban's junior, and Ban considers him to be both an underling and a friend. His hobby is watching movies, especially Spark Wars.

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Takumi's childhood doctor. He works at AH Tokyo General Hospital.