Tomoatsu Naoe lives a routine existence as a massage therapist until he meets an unusual client, Erufuda. While treating her, he learns she is an elf who has drifted into our realm. Once in this world, she developed a taste for junk food and now her weight prevents her from returning to her homeland.
Determined, Naoe offers her a diet plan so she can shed the excess and travel back. Erufuda follows his guidance, succeeds, yet soon Naoe encounters her again—now she has gained the weight back. As he keeps advising her, they encounter additional beings from other worlds who share the same goal of losing weight.
