Kana, a married woman, works as an insurance sales agent, but lately, Yoshimura, a chiropractor she's been assigned to, has turned out to be a typical lecherous old man who constantly tries to lure her to his home. Gentle and easily pressured, Kana finds it troublesome to refuse and ends up giving in to his invitations every time. One day, after twisting her ankle on her way back from a sales call, she visits Yoshimura the following day, only to have him notice her injury and forcefully insist on giving her a treatment. Unaware of his lewd intentions, Kana reluctantly submits herself to his manipulative therapy.