Chaos;Head (Japanese: カオスヘッド, Hepburn: Kaosu Heddo, stylized as ChäoS;HEAd) is a 2008 anime television series created by Madhouse based on 5pb. and Nitroplus's video game of the same name, and is part of the Science Adventure franchise. It is set in Shibuya, Tokyo, and follows Takumi Nishijo, a high school student who develops paranoia and delusions after having witnessed one of a series of murders. He meets several girls who have an interest in him, and who he suspects might have a connection to the murders. He eventually learns of the existence of people with the power to project delusions onto others' minds, and of an organization using a machine to do so artificially for their own gain.