Bijukubo / Beautiful Mature Mother

Yohei lives happily with his mother Kaho and his cousin Fumika. One day, Kaho confesses to Yohei that she is actually his father's older sister, not his mother, and that his real mother died a long time ago. This admission greatly changes Yehei's attitude towards Kaho.

A few days later, a woman named Ikue moves into the house next door. When she meets Yehei, she starts crying, and Kaho turns pale. Ikue tells him that she is a relative of Yohei's mother and wants to take him in as an adopted son. Kaho and Fumika try to stop her, and from that moment on, the characters' unusual and passionate life begins.