Tsubaki, a teacher at a prestigious private girls' school, is chloroformed by a suspicious individual on her way home and loses consciousness. When she wakes up, she finds herself bound in an unfamiliar room, being assaulted by an unknown man. Despite enduring increasingly humiliating acts, she desperately resists, clinging to her pride—but her cries gradually grow weaker. As her strength fades, she begins to sense the twisted obsession of her captor, an unsettling presence closing in from the shadows.