You find yourself standing in front of Smiley Boar, a relaxation clinic, and the place where the human Naoe worked as a seitai. Originally a weight coach for other humans, it all started with a certain Plus-Sized Elf named Elfuda who got addicted to fries and couldn't return to her world unless her weight was the same as it was when she arrived. Since then, he's met a dark elf, a mermaid, a mandrake, an ogre, a werewolf, an orc, a kobold, a satyr, a skeleton, a dragon, and a cyclops, all of whom he's helped to lose weight in some way!