Yumi is a busy office lady who works hard every day, so to avoid building up stress, she begins visiting a massage clinic. There, she bonds with other women who come seeking relaxation. One day, skillfully lured with persuasive words, Yumi finds herself gradually letting go of her tension inside the treatment room. The assistant gently slides a hand beneath her underwear, and as she feels that warmth, her body begins to respond, sapping her will to resist. Soon, a cock is inserted into her, and overwhelmed by pleasure, she is brought to orgasm. In that moment, Yumi experiences a sensation of no return.