A naive beautiful girl is the joint property of her boyfriend's relatives Hinako Seto
Winter vacation. Hinako had come to the house of her boyfriend Makoto's relatives without telling her parents. Dango, who is an elder figure, and Makoto's uncles and cousins come and go there. This area was a demonic place where the lewd practice of ``tasting'' the lovers and brides of the male members of the family with all their relatives was rampant! Dango and his friends notice her cuteness and beautiful breasts, and try to impress her in various situations. Having her small breasts thoroughly played with, Hinako's masochism blossoms and she begins to desire fornication...