A man who has just started living alone in an apartment in Tokyo for his university life. One day, when he goes out onto the balcony, he finds a pair of panties that had been hanging out to dry by his neighbor this morning. He rushes to deliver them to her, only to find his beautiful, half-naked wife, Yui, coming out. From that day on, his dreamlike apartment life begins. From the balcony, he can see Yui changing clothes, sees Yui panties while cleaning, and witnesses her passionate kiss with her husband... And one naughty incident after another occurs...