Shunsuke has sexual desires for his mother, Nozomi. She raised Shunsuke all by herself, so they live alone. He spends almost all of his time on masturbating while thinking of his mother. When the situation gets unbearable and his urges get hard to control, he tries talking to Akiko, a widow living nearby, who's also the mother of his childhood friend, Akira. Akiko wouldn't pass up on the opportunity to offer herself as a substitute to his mother.
"Make love to me instead of your mom..."
In the end, Shunsuke realizes just how deeply he feels for his mother and finally finds the courage to tell her about it.

That being said, what will happen to our protagonist?
After all, there are still two stunning beauties who wouldn't mind "cheering him up"...