My older brother asked me to help my family, so I decided to train my mother and daughter all together to have her do with her creampie and make her submit.

It was his brother-in-law Yuji who reached out to his wife Sakura, who had lost her husband to illness and was at a loss, and his daughter, Riina. After his brother died while alive, Yuji had been asked to take care of the two of them. Yuji, who had originally had a crush on Sakura, agrees to her, and the three of them were supposed to start living together... However, from the day they started living together, Yuji's attitude suddenly changes, causing her hidden feelings and sexual desire to go wild. The two have nowhere to go and are unable to resist, and end up in a life of humiliation...