My mother's best friend is just an old lady. Momo has completely dispelled that stereotype from Ryota. His eyes can't take their eyes off her plump, voluptuous body that exudes calm sexiness, and her gigantic breasts that look like they might burst out at any moment. Ryota, wanting to get closer to her at all costs, ends up browsing her underwear on a whim. But then Momo appears and approaches him, saying, "I'll teach you about the female body."