The original Chaos;Head visual novel was released for the Xbox 360 in Japan, marking the debut of the game.
Chaos;Head was later ported to PlayStation Portable and Microsoft Windows, expanding its availability beyond the Xbox 360 platform.
Chaos;Head Noah, an enhanced version of the original game with additional content and storylines, was released for the Xbox 360.
An anime adaptation of Chaos;Head aired, increasing the franchise's popularity outside the gaming community.
The follow-up game to Chaos;Head, Chaos;Child, was officially announced, continuing the story and themes of the original game.
A massive earthquake strikes Shibuya, causing widespread destruction.
Reports begin circulating about mysterious, gruesome murders in Shibuya, referred to as the New Generation Madness.
Takumi Nishijo, the protagonist, receives a strange email hinting at upcoming events and conspiracies.
Takumi meets Rimi Sakihata, whose behavior seems linked to the unfolding mysteries.
Takumi obtains the Di-Sword, a weapon that manifests from his delusions and dreams.
Takumi confronts the identity of the New Generation Madness killer and learns more about his own connection to the events.
Takumi uncovers the secret behind Project Noah, a conspiracy involving mind control and reality manipulation.
Takumi experiences significant reality shifts, blurring the line between delusion and reality.
Takumi faces off against the mastermind behind the New Generation Madness and Project Noah conspiracies.
The aftermath of the events in Shibuya is revealed, with Takumi reflecting on the true nature of his experiences.
