In this adult role-play, Hijiri lives with her husband in Tokyo and spends every summer with her younger sister and brother-in-law in the countryside. Her brother-in-law Seiji has long admired her but keeps his feelings buried. When he goes to gather wild vegetables to clear his head, a bored Hijiri joins him. Hours later, a sudden downpour forces them to shelter in a remote mountain hut. With no one coming to collect them and the two left alone until morning, Seiji can no longer contain his secret desire...