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.
There's no point, but I don't feel 
right if I'm not doing something.
لا هدف من ذلك، لكن لا أشعر على ما يُرام
إذا لم أفعل شيئاً
Es bringt zwar nichts,
aber ich muss Zeit totschlagen.
No tiene caso,
pero no quiero estar quieto.
No vale de mucho,
pero no quiero estar quieto.
Ça n’a aucun sens,
mais il faut bien s’occuper.
Non serve a niente, ma se non faccio qualcosa,
non mi sento tranquillo.
Não tem significado, mas
fico nervoso sem fazer nada.
Смысла нет, но от безделья, 
только хуже становится.