Shy glasses-wearing high school girl Miyu lives with her close older brother. The brother secretly views Miyu as a romantic interest, gradually escalating their relationship by invading her privacy and planting hidden cameras in her room. One day, his plans are finally about to come to fruition—until he's caught in the act by their father. The shocking discovery drastically changes the siblings' relationship. Yet, only Miyu is summoned to her parents' bedroom, leaving the true reason shrouded in mystery.