Manga by author Otsuka Eiji

After a long absence, the young shaman Samizo Kohei returns from the dead with a prophecy of the apocalypse. Or part of him returns, at least - most of his body has been replaced with the transplanted body parts of his former friends, all retaining their distinctive personalities. He returns to his home in Shinjuku, where he works as a psychic surgeon in an unlicensed clinic. Here he serves as the unofficial guardian of the Shinjuku underground, solving paranormal murder mysteries, with the assistance of an assortment of other bizarre mystics and semi-human allies. Meanwhile, the others wonder exactly what Kohei has become, and whether he has returned to prevent the apocalypse, or to initiate it.

The main character is a detective, Kazuhiko Amamiya, suffering from Multiple Personality Disorder (a.k.a. Dissociative Identity Disorder). Starting out as a violent detective series with a twist (the twist being the variant personalities that take over Detective Amamiya at various intervals), the series evolves into an exceptionally complex and involved sci-fi conspiracy story.

Your body is their business! Five young students at a Buddhist university, three guys and two girls, find little call for their job skills in today's Tokyo...among the living, that is! But all that stuff in college they were told would never pay off--you know, channeling, dowsing, ESP--gives them a direct line to the dead...the dead who are still trapped in their corpses and can't move on to the next reincarnation. The five form the Kurosagi ("Black Heron"-their ominous bird logo) Corpse Delivery Service: whether suicide, murder, accident, or illness, they'll carry your body wherever it needs to go to free your soul! The kids from Kurosagi can smell a customer a mile away--it's a good thing one of the girls majored in embalming!