Yuya eagerly awaits the visit of Keiko, his mother's friend and a world-class bodybuilder. Seeing her again after so long, he is captivated by her strong, beautifully sculpted physique. That night, as they reminisce and share heartfelt conversation, genuine emotions begin to stir. Torn by struggles in her marriage, Keiko finds her heart moved by Yuya's feelings, and the two give in to their desire. They indulge in secret trysts, careful to avoid his mother's watchful eye. On the eve of Keiko's departure, Yuya visits her room, marking the beginning of a new relationship.