Yuichi lives with his mother, Yukari. Since Yuichi entered university, Yukari has been working hard, and while he worries about her health, he also feels lonely because they don't get to see each other often. One day, Yuichi waits for his mother to come home and falls asleep in her futon. When he wakes up, he finds his mother, Yukari, sleeping next to him. Wanting to indulge in his mother's sweet scent and warmth, Yuichi starts touching her body...