An ordinary salaryman dies and awakens to find himself in an unfamiliar otherworld. And his new body? That of a slime, the weakest monster of all.

With no cheat abilities and forced to grow stronger through sheer, painstaking effort, isn't he utterly doomed? Yet, not wanting to die, he apparently has no choice but to do his best.

This is the story of a protagonist who, true to his former human self, is at times cunning and at times pure-hearted, navigating his struggles to grow stronger.