Suzuha longs for her brother Kazuma as the summer heat intensifies, her hidden desires growing undeniable. One evening, she confesses her feelings, and he surrenders to the same forbidden passion. Their mutual longing blossoms into a steamy, intimate encounter, full of whispered confessions and fervent embraces, sealing their relationship in a torrent of sensual exploration and raw, unrestrained ecstasy under the warm summer night.