At a certain concept cafe, the rude waitress (Yuki) serves a man who decides to leave due to her poor attitude. However, when he tries to pay his bill, he's presented with an exorbitant price tag. Determined not to be taken advantage of, he confronts the manager about the cost but soon realizes that the manager is actually an old acquaintance who once helped him out. Feeling indebted, the manager offers up Yuki as payment, hoping to win back some favor. Reluctantly, she agrees. Unbeknownst to them both, the man has ulterior motives; he secretly drugs Yuki and transforms her into a seductive tool for luring in customers for his new service.

とあるコンセプトカフェ。態度の悪いコンカフェ嬢（ゆうき）の接客に男は呆れて退店しようとするが店から法外な値段を提示されてしまう。凄んで金をせしめるつもりの店長とゆうき。しかし店長は男が昔世話になったコワモテ先輩だと気づき、許しを乞う為に自分のオンナでもあるゆうきを差し出す。怯えるゆうきを媚薬で堕とすと、悪徳コンサルタントと化した男はゆうきを使って客を虜にする新サービスを提供するのであった。