Worried about Tooru having a slipped disc, Mako comes to her parents' house with her husband, Nobuo. Her husband has to go home for work, but seeing Tooru looking lonely, Mako decides to stay behind. That night, Mako drinks with her father-in-law, and after drinking alcohol that she is not used to, she falls asleep. Seeing Mako's plump lips, Tooru becomes aroused and steals a kiss from her. The next day, Mako approaches Tooru cheerfully, unaware of what happened last night. However, Tooru cannot forget what happened last night, and he desires Mako's lips, her voluptuous breasts, and her pussy...