This is the one of the best I ever seen. Satoru is an ordinary 37-year-old corporate worker living in Tokyo. He is almost content with his monotonous life, despite the fact that he doesn't have a girlfriend. During a casual encounter with his colleague, an assailant pops out of nowhere and stabs him. While succumbing to his injuries, a mysterious voice echoes in his mind and recites a series of commands which he could not make sense of.
After regaining consciousness, Satoru discovers that he has been reincarnated as a Slime.
After regaining consciousness, Satoru discovers that he has been reincarnated as a Slime.