"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 killed and reincarnated in a fantasy world as a slime, a low-level creature. He gains unique abilities, including the power to absorb and mimic other beings, which allows him to navigate this new world. As a slime, he adopts the name Rimuru Tempest and embarks on adventures, forming alliances with various creatures and humans. The series explores themes of friendship, power, and the challenges of building a community in a world filled with magic and monsters.