[Reducing Mosaic]JUL-530 Since my older brother who passed away first asked me to take care of the family, I decided to internally train and subjugate both the mother and daughter through insemination──

It was Yuji, his brother-in-law, who reached out to his wife, Sakura, and her daughter, Riina, who lost her husband to illness. Yuji was asked by his older brother to take care of them after he passed away. Originally, Yuji, who was in love with Sakura, willingly agreed, and the three of them started living together... or so it was supposed to be. However, Yuji's attitude changes suddenly from the day they start living together, causing his hidden feelings and his libido to run wild. With nowhere to go, the two of them can't resist and face the days of thunder...