MPD-Psycho Vol.1 - Vol.12

MPD Psycho, short for Multiple Personality Detective Psycho, is a manga series written by Eiji Otsuka and illustrated by Shou Tajima, published in Kadokawa Shoten's Comic Charge since 1997. The series follows a police detective suffering from multiple personality disorder.

Yosuke Kobayashi is a detective and is on the case of a serial killer who dismembers his victims. The killer later sends Yosuke's girlfriend dismembered but kept alive. Yosuke hunts down the killer and due to the events, loses his sanity and develops Dissociative identity disorder with the two main personalities being Kazuhiko Amamiya, a cool headed detective and Shinji Nishizono, a reckless psychopath. After being placed in prison for murderering the killer, Yosuke Kobayashi is released and works for an independent detective agency ran by Machi Isono. Later serial killers are appearing with barcodes in their left eyes, which Yosuke Kobayashi also has. Yosuke Kobayashi investigations lead him to believe he is not who he thinks he is and that his Kazuhiko and Shinji personalities have existed since childhood. – Wiki