Raised in a single-parent household, Shun carried deep emotional scars of loneliness and insecurity from childhood. Gradually, his attention turned toward his own mother, Maki. Small moments in daily life—the sight of her lips as she ate ice cream, the scent of her discarded underwear, the silhouette of her body through the fogged glass of the bathroom—planted seeds in Shun's mind, nurturing growing fantasies. His feelings for his mother were not mere romantic desire, but a tangled mix of profound affection, anxiety, and guilt. As these emotions festered within him, Shun's psyche slowly warped through the routine of everyday life, and the relationship between mother and son began to shift irreversibly.