Sei, who lives with her husband in Tokyo, has a tradition of spending every summer at her sister's house in the countryside. Seiji, her brother-in-law, has a crush on Sei, but keeps his feelings hidden deep in his heart. To take his mind off things, he goes to pick wild vegetables, but Sei, who says he's bored, decides to join him. A few hours later, while the two are happily picking wild vegetables deep in the mountains, they are hit by a sudden heavy rain and take refuge in a nearby mountain hut. No one comes to pick them up, and they are left alone with Sei until morning... In this situation, Seiji can't suppress his hidden feelings...