Asahi is an office worker with a large, round, and firm chest who always wears revealing clothes that accentuate her breasts, making every man almost envy the chance to touch them. Even her 84-year-old grandfather, whom she visits to take care of, pretends to have memory loss in order to take advantage of massaging and even engaging in incest with his own granddaughter. Despite his old age and the loss of his wife, he has been feeling bored and started a habit of buying a lot of adult films, leading to a strong repressed desire in his mind. Any small stimulus would trigger an intense outburst, and his granddaughter happened to be that stimulus. Although she tried to resist and constantly told him to stop, he easily overpowered her with his desire, doing whatever he wanted to her young and attractive body.