Living an ordinary family life, the son of the Tomoda household was always surrounded by his friend Kotaro, who frequently came over to play. However, Kotaro's true intention was focused on the boy's mother, Maki, whom he spent time with regularly. When the son discovers their secret relationship, jealousy and rage consume him, driving his desire to claim his mother as his own. As family tranquility begins to crumble, twisted love and desire collide in a dangerous triangle.