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The world is divided into four nations -- the Water Tribe, the Earth Kingdom, the Fire Nation and and the Air Nomads -- each represented by a natural element for which the nation is named. Benders have the ability to control and manipulate the element from their nation. Only the Avatar is the master of all four elements. The ruthless Fire Nation wants to conquer the world but the only bender who has enough power, the Avatar, has disappeared ... until now. His tribe soon discovers that Aang is the long-lost Avatar. Now Katara and Sokka must safeguard Aang on his journey to master all four elements and save the world from the Fire Nation.

After dying while protecting his junior colleague at work from a knife attack, Satoru Mikami is reincarnated as a slime in a magical world. As someone who is reincarnated, he gains the Skills "Predator" and "Great Sage". While strolling around, he meets the Storm Dragon Veldora who becomes his friend and names him Rimuru. In return, Rimuru gives the surname Tempest to both of them and agrees to snatch Veldora from his prison so that one day they can permanently break Veldora's prison. The mysterious disappearance of the Storm Dragon results in huge consequences as his presence acted as a sort of buffer zone. Meanwhile, Rimuru starts his adventure by traveling, meeting new people, fighting some of them, and turning them into allies by fighting them.