The whole family has left the nest, spending incest with their mother in their parents' house.

Kenji was born to the second son of three siblings. From the mother Megumi, I got the impression that she was a child that was hard to handle... One spring of the year, my older brother got a job and lived alone, and my younger brother enrolled in a boarding university. His father is on a single business trip, and his life changes rapidly, and Kenji and Megumi begin living together as a mother and child. The lively house suddenly becomes quiet and Megumi feels a sense of loss... Seeing her mother's situation, Kenji felt frustrated and emptiness, and tried to regain the love she had never been able to monopolize before...