After years of marriage, housewife Nao finds her relationship with her husband growing cold and distant. Seeking an escape from her monotonous daily life, she decides to treat herself to a massage for a change of pace. The therapist, Oshima, is a skilled masseur whose expert touch deeply stimulates Nao's body, awakening sensations she's never experienced before. A few days later, realizing Nao's hidden masochistic tendencies, Oshima decides to take things further—he binds her tightly with hemp rope, immobilizing her completely like a spider's prey. Restrained and helpless, Nao discovers her body responding with intense pleasure, dripping with arousal.