Sei, who lives in Tokyo with her husband, has a tradition of spending every summer at her sister's house in the countryside. Her brother-in-law, Seiji, harbors feelings for Sei, but these feelings remain hidden. To alleviate their boredom, they go to pick wild vegetables, and Sei, who claims to have nothing better to do, goes with them. Several hours later, while the two are happily picking vegetables deep in the mountains, they are suddenly caught in a downpour and seek refuge in a nearby mountain cabin. No one comes looking for them, and Sei is alone with Sei until dawn… Under these circumstances, Seiji can no longer suppress his deep-seated emotions…
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