Natsuzuki, a high school girl, continued to live alone bravely after her parents passed away one after the other. Although her uncle, who is all men, repeatedly asked her to live with him, she was too scared to go to her relatives' house, who always looked at her big breasts with lustful eyes. However, she was targeted by her relatives who lived in the same apartment building, and they started threatening her and forcing her to do erotic things at every opportunity...