Manga: Judas

Meet Judas, the spirit of death, is cursed for his sins and must reap 666 souls in order to get back his human body. Problem is, he's an Intangible Man, thus can't actually kill anyone. Thus he takes Eve, a trappish young boy, and possesses him to use his death powers and reap souls... Except it seems to get plenty sidetracked by people who are obsessed with 'Eden', and the inhumane acts they commit to find it...

...Much better than it sounds.

Tropes associated with this manga: