During the peak of summer, her brother-in-law temporarily moves into the family home, where he is treated coldly by everyone, leaving him filled with deep resentment. The only one who supports him is Asahi, his younger brother's wife. Drawn in by her kindness, he loses all reason as his uncontrollable desire erupts and he takes her by force. Though she initially resists, Asahi's heart begins to waver upon sensing his sincere emotions, and gradually she starts to reciprocate his feelings.