Taro, the de facto head of the household, constantly monitors his wife Mikako's every move. His domineering presence looms unchecked within the family, forcing Mikako to live in quiet fear while maintaining daily life. To their son Jiro, his parents' relationship resembles that of master and servant. Resentment toward his father grows in Jiro, who treats only his mother with kindness. Amid this tension, a secret affection quietly develops between mother and son, eventually evolving into a forbidden bond. When Taro discovers their affair, consumed by rage and jealousy, he launches a vicious and calculated attack against the pair.