Satoru Mikami, a 37-year-old corporate worker, leads an ordinary life until he is unexpectedly stabbed by a passing robber. As he lies on the brink of death, he hears a mysterious AI-like voice reciting commands. When he wakes up, he finds himself reincarnated in a fantasy world—no longer human, but as a slime! Now equipped with the ability to absorb anything and acquire its powers, Satoru adopts his new identity as Rimuru Tempest.

While exploring his new body’s abilities, Rimuru befriends Veldora, a powerful dragon imprisoned for 300 years. Promising to help free Veldora, Rimuru embarks on an adventure in this strange new world. Armed with newfound powers and determination, Rimuru sets out to change his fate and shape the future of his world.