A few years ago, Nozomi was forced to divorce her husband after he cheated on her. Since then, she has poured all her love into her only son, Souta, and they have lived together as a family of two. However, recently, as Souta enters puberty, his attitude begins to change. He no longer depends on his mother like before, and grows increasingly cold toward her. Desperate to preserve their bond and fearing their relationship will collapse, Nozomi clings to him—eventually pushing the boundaries into forbidden, taboo territory.