Wataru visits his aunt's home in Tokyo, where the childless Kitajima couple has always warmly welcomed him like their own son. Wataru deeply values their kindness and looks forward to seeing them again after some time apart. However, this visit holds another secret purpose—he has long harbored intense feelings for his beautiful aunt, Reiko. Now entering adolescence, he increasingly sees her as a woman, consumed by uncontrollable desire. Tonight, he finally resolves to act on those forbidden emotions.