Dr. Kenzo Tenma, a brilliant Japanese neurosurgeon working in Germany, saves the life of a young boy named Johan Liebert. Years later, Tenma discovers that the boy has grown into a charismatic, psychopathic serial killer.

Denji, a destitute young man saddled with his deceased father's debt, merges with his pet chainsaw devil, Pochita, to become a devil hunter for the government.

It provides a deeply nuanced, unfiltered look into Rudeus’s psychological flaws and his slow, rewarding redemption arc. slime That Time I Got Reincarnated as a Slime