Kazuki Okino, a breezy and optimistic high schooler, shares an unbreakable bond with childhood friend Otome Sakuragi, dreaming of a future marriage. His younger sister Rinka nurses hidden romantic yearnings, infusing their exchanges with quiet friction. Kazuki’s world fractures upon receiving anonymous DVDs documenting Otome’s coerced encounters with older men, eroding his grip on reality. Initially brushing off early hints of Otome’s victimization, Kazuki’s resistance crumbles as the DVDs escalate in brutality. Paralyzed by fear, he retreats emotionally, growing distant and cold toward Otome. His despair peaks upon witnessing Rinka enter a suspicious car with an older man, triggering complete psychological collapse. A later confrontation exposes Rinka’s orchestration of the torment—twisted acts fueled by obsessive jealousy to claim his exclusive devotion. She confesses to manipulating Otome’s exploitation and coerces Kazuki into physical intimacy, weaponizing guilt to shift blame onto him. The story closes with Kazuki years later, seemingly settled as Otome’s husband and father to their daughter. This fragile normalcy ruptures when he discovers a DVD identical to those that haunted his youth, corroding certainty in his present. The dissonance between surface stability and unresolved trauma leaves his psychological fate suspended, his grasp on truth perpetually uncertain.