Chaos;Head

Takumi is a senior in high school who is reclusive and uninterested in 3D objects. People in his area become alarmed as a mystery serial murder case occurs. One day as he is online chatting, a man calls him out of the blue and provides him a URL. When he visits the website, he discovers a blog graphic that alluded to a potential murder case. The following day, it actually occurs. As a result of his apparent schizophrenia and the incredibly isolated existence he leads as a hikkikomori, Takumi Nishij experiences severe delusions. He unintentionally discovers a grisly murder scene one day, which is a link in the "New Generation" chain of events. His life is then entangled in these events, and he meets a group of progressively crazy anime girls carrying swords.