Chaos;HEAd

CHAOS;HEAD (カオスヘッド), the first entry in the Science Adventure Series, is a visual novel developed by 5pb. and Nitroplus, initially released for Windows in 2008. Set in Shibuya, the story centers on Takumi Nishijou, a reclusive otaku who gets entangled in a series of bizarre murders known as the "New Generation Madness." The game is notable for its "Delusion Trigger" system, where player choices regarding delusions impact the story's progression. An enhanced version, CHAOS;HEAD NOAH, added new character routes, improved graphics, and new story scenes and was ported to various platforms. The series also includes spin-offs like CHAOS;HEAD Love Chu☆Chu!, as well as anime, manga, and other media. CHAOS;HEAD is known for its psychological horror, mystery, and deep exploration of delusion, making it a pivotal entry in the Science Adventure Series.