Beauty-conscious Shiori visits a spa and accepts a male therapist’s offer to try an enzyme inhalation treatment. He secretly mixes in an aphrodisiac, and her body begins twitching uncontrollably. She resists, but the modified mask will not come off, forcing her to keep inhaling until her mind goes numb and he can fondle her entire body at will. Her huge breasts and clit become so sensitive that she convulses and arches through orgasm after orgasm. Eventually she grows dependent on the pleasure, puts the mask on herself, and begs for more, making broken cries, pulling an overwhelmed orgasm face, riding with her own hips, and squirting repeatedly at the slightest stimulation.