Episode :
Ritsu and Kyouya, compelled by their circumstances, cross the boundaries of sibling relationships and engage in sexual activity. Although they share a mutual attraction, their conflicts persist. The initial night they find themselves alone while their parents are away leads to a confrontation. Kyouya attempts to escape, but Ritsu intervenes, resulting in both of them tumbling to the floor. A brief silence follows as they stay in a vulnerable position. That night, nothing hinders them from acting on their desires.
