SMA-111 - Crossing the forbidden line... A crazy battle with Dad over Mom

A strict father with a high social status and his obedient wife, Yuriko. But beneath the surface, the family is rotting. A son obsessed with his mother, and a mother who gives everything to her son. One day, the father challenges him: "Let's see who can truly claim Mom." A twisted competition begins. The mother has turned into a mere female, and the immature son treats her like a plaything. Where will this depraved game end?