Yoshikage Kira (Dead Man's Questions)

Kira is shown some time between the End of Part 4 and the End of Part 6 as a vagabond spirit who is unaware of his identity. Now a ghost trapped in the living world after his death, Kira can't remember anything but his name, but is sure he cannot get to heaven. However, he still shows traits of his personality, as he wants a normal life and doesn't wish to attract the attention of living people. Not sure what to do with his eternal existence, he now works for a monk, doing the "dirty work" of killing targets she gives him in exchange for money. He believes that, by making this job his purpose to live, he might find happiness.

Dead Man's Questions (Manga)