Chaos;HEAd

Takumi Nishijō suffers from intense delusions as a result of his apparent schizophrenia and the extremely secluded lifestyle he lives as a hikkikomori. One day he accidentally stumbles upon a gruesome murder scene, a part of a chain of events called "New Generation". After this, his life gets caught up in these events, and he meets a bunch of increasingly insane anime girls with swords.