Mikan, a daughter-in-law, has been tasked with caring for her elderly and frail father-in-law, Yamajii. Although it was a promise made at the beginning of their marriage, when she sees Yamajii with her own eyes, Mikan is put off by his old man smell. Then, Yamajii, who realizes Mikan's Kokoro, begins to sexually harass Mikan under the guise of caring for her, saying, "I'll teach you how it feels to be cared for."