When his father remarried, Takeshi suddenly had a new mother and sister. His stepmother Yumi and step-sister Chie were both attractive women with outstanding figures, which confused Takeshi, but when his father went on a business trip, he ended up spending time alone with his stepmother and daughter. The misfortune continued when a leak in the roof made Takeshi's room unusable, and the three of them ended up sleeping side-by-side. He tried desperately to hold back his lust for the mother and daughter sleeping next to him, but when they saw his rock-hard cock, the mother and daughter revealed their true nature and began seducing Takeshi by sandwiching him between them.