Mikami Satoru, a businessman, is stabbed by a criminal on the street and killed. When he regains consciousness in the darkness, he finds that he's been reincarnated as a slime! With nothing better to do, he spends his time devouring all the rare herbs and precious ores he comes across. As he does, he encounters the Storm Dragon Veldora, who was sealed in this cave 300 years ago by a hero's "Unlimited Imprisonment" skill. He's frightened at first, but as they talk, he becomes friends with the long-isolated Veldora.
A human hero? Sounds like 
something out of a video game.
بطلة بشريّة؟ وكأنه شيء نراه في لعبة فيديو
Held der Menschen?
Wie in einem Spiel.
¿Un héroe humano?
Parece salido de un videojuego.
¿Un héroe humano?
Parece salido de un videojuego.
Défenseur de l’humanité ?
Eroina degli uomini?
Uma heroína humana?
Isso parece até um videogame.
Герой людей?
Ну прямо как игра какая-то…