Yosuke's desires spiral out of control after beginning a forbidden relationship with his stepmother. What started as a physical affair gradually transforms into an overwhelming obsession. One day, seeing his father and stepmother acting affectionate toward each other ignites a deep jealousy within him. Unable to suppress his emotions, Yosuke boldly attempts to claim his stepmother's body even with his father nearby. This impulsive decision drastically alters the course of his life.