Synopsis：Yohei is happy living with his mother Kaho and his cousin Fumika. But one day, Kaho tells Yohei that she is actually his father's sister, not his mother... She also reveals that his real mother passed away long ago. Shocked by this revelation, Yohei begins to see Kaho as a woman rather than his mother. A few days later, a woman named Ikue moves into the house next door. When Ikue sees Yohei for the first time, she suddenly bursts into tears, and Kaho's face turns pale. Ikue tells them that she is a relative of Yohei's mother and wants to take him in as an adopted child. Naturally, Kaho and Fumika refuse... From that day on, their lewd and erotic life begins...