Kenta is a struggling student living alone in a cheap apartment far from his university. However, he is treated to meals by the Nomoto family, who live next door. One day, the bicycle he received from the Nomoto family starts to malfunction, so he asks his wife Kyoka to take a look at it, but Kenta senses something is off. Kyoka is not wearing any underwear! From that day on, Kenta can't help but be curious about Kyoka's crotch. However, Kyoka seems to mock Kenta's feelings...