"I don't know what to do... I'm truly at a loss... This is so embarrassing..." murmured mother Yuki, constantly looking down. Troubled by her son's uncomfortable, voyeuristic gaze, she decides to consult her homeroom teacher. The teacher, fully aware of Yuki's distress, instead becomes consumed by his own lewd fantasies. Moreover, Yuki begins noticing the strange disappearance of her underwear... Burdened with helplessness and anxiety, she finds nowhere to turn, slowly drawn into the teacher's depraved imagination.