Kyo is a young man who moves next to the Shirotsuki couple as they go to college. Today, see-through and obscene underwear was hanging on the balcony next door, where the usual plain underwear was hanging. In fact, Ayane, who felt a rut in her husband's life, was buying see-through underwear because she was afraid of having sex. Kyo, who was glued to her see-through underwear, was grinning and thrilled her unpleasant fantasies. However, a piece of underwear blows in the wind and falls off. When I deliver the see-through underwear that has fallen to Ayane...