"Tensei Shitara Slime Datta Ken," also known as "That Time I Got Reincarnated as a Slime," is a Japanese light novel series written by Fuse. The story follows Satoru Mikami, a middle-aged man who is reincarnated in a fantasy world as a slime, a low-level creature. He gains unique abilities and begins to explore his new life, forming friendships and alliances with various beings. As Rimuru Tempest, the slime protagonist, he seeks to create a peaceful society for all races. The series explores themes of friendship, community, and the challenges of leadership while featuring a mix of action, adventure, and humor.