When Yuma’s sister, Akane, reveals that it’s her ovulation day, their sibling bond takes a deeply intimate turn. Overcome with desire, she guides him into her room, where tender whispers and lingering kisses give way to raw, fervent passion. They surrender completely, entwined in mutual ecstasy, as years of hidden affection erupt into an unbreakable, sensual union that satisfies their deepest forbidden urges.