Thirty-seven-year-old Satoru Mikami is a typical company employee, who’s completely content material along with his monotonous life-style in Tokyo, aside from failing to nail down a girlfriend even as soon as all through his life. Within the midst of a informal encounter along with his colleague, he falls sufferer to a random assailant on the streets and is stabbed. Nevertheless, whereas succumbing to his accidents, a peculiar voice echoes in his thoughts, and recites a bunch of instructions which the dying man can not make sense of.
When Satoru regains consciousness, he discovers that he has reincarnated as a goop of slime in an unfamiliar realm. In doing so, he acquires newfound abilities—notably, the ability to devour something and mimic its look and skills. He then stumbles upon the sealed Disaster-level monster “Storm Dragon” Veldora who had been sealed away for the previous 300 years for devastating a city to ashes. Sympathetic to his predicament, Satoru befriends him, promising to help in destroying the seal. In return, Veldora bestows upon him the title Rimuru Tempest to grant him divine safety.
Now, liberated from the mundanities of his previous life, Rimuru embarks on a recent journey with a distinct aim in thoughts. As he grows accustomed to his new physique, his gooey antics ripple all through the world, regularly altering his destiny.