Sana was visiting her father's parents' house. At her house, Sana's uncles were all together. Her father has to go back to Tokyo first because he has a job. One day, she squirts the crotch of her uncle, who is taking a nap, with a mischievous heart and ejaculates. Her uncle had woken up before she knew it. Since then, the recognition that she is "Sana is an obscene girl" has spread among her uncles, and she is targeted by her middle-aged men...
