Oshima Yuka lived alone with her father-in-law, Tomomitsu, who had come to Tokyo and was temporarily staying at her home. Yuka, who had once been his student, welcomed him warmly alongside her husband. However, she felt uneasy about his sudden arrival. A few days later, Tomomitsu, reminded of his late wife by Yuka's presence, confessed an important truth to her. Deeply moved by his words, Yuka desired to fill the emptiness in his heart and chose to touch his body passionately. Yet after that, Tomomitsu refrained from making further advances. Wanting to gently heal the lingering longing in his heart, Yuka softly kissed him with her lips.