Nanako Yoshikawa warmly welcomes her nephew Daisuke, who has come to stay for a week due to job training. The next morning, as she helps him adjust his suit—something he's not used to—she accidentally touches his strong, toned chest, gradually awakening her own interest. The following day, she begins dressing more boldly, drawing attention to her voluptuous figure, which pushes Daisuke into greater arousal. "Are you sure you want someone like me, an older woman?" she asks, but as the words leave her lips, she passionately entwines her tongue with his, rapidly deepening their forbidden relationship.