The story revolves around an ordinary middle-aged man named Satoru Mikami. The main character works in a large financial company. One day, he gets involved in a street fight and dies while protecting his colleague from a knife-wielding thug. But that's just the beginning of his journey. Satoru is reincarnated in another world where magic exists, and multiple races coexist on the same planet. Now he is a sentient, slime-like creature named Rimuru, whose kind is oppressed and discriminated against.