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.
I never dreamed a life like 
this was waiting for me!
لم أتخيّل يوماً أن حياة كهذه كانت تنتظرني
Nunca creí que me esperara una vida así.
No esperaba una vida tan movidita.
Qui aurait imaginé
une vie pareille…
Non avrei mai pensato
che avrei avuto una nuova vita...
Nunca sonhei com
a vida que me esperava!
И не мечтал никогда о такой жизни!