"I want to pass college this year..." Kenta, a ronin who lives alone in Tokyo and spends all his time studying, had the only moment of rest. That was when he got in touch with the Anno family's married woman, Yumi, who lived next door. One day, Kenta, who visited Yumi's house for her errands, encounters Yumi doing laundry in her garden. "Yumi-san, something is different from usual...?" Kenta noticed. To the fact that Yumi is no panties! ! From that day on, Kenta can't forget Yumi's no panties...
