Reiko remarried to Kenichi, who has two stepchildren. However, Reiko's plump and obscene body gives a strong stimulus to her brothers, Kenji and Masao, who have reached their age. And strangely, Reiko passes by Kenichi on the night shift and falls into sexlessness. Then, the brothers begin to fight to make Reiko their own. Masao shows off his innocent erection Ji Po and presses for sexual processing, and Kenji, who was watching it, asks for his body at a later date, "Do it to me." And the brother's desire further distorted Reiko ...