A hardworking freeter named Rena was struggling to make ends meet while juggling multiple part-time jobs to pay her boyfriend's tuition fees. Exhausted and overwhelmed by her responsibilities, she made numerous mistakes at work, ultimately leading to her termination. Desperate for any means of income, she pleaded with the store manager, who offered her a chance to stay employed under one condition - performing sexual services during late night shifts. Reluctantly accepting this unfair demand, Rena found herself being aggressively trained in the art of servicing her busty colleague...

愛する彼氏の学費を稼ぐ為いくつものバイトを掛け持ちして必死に働いていたフリーターの怜奈は、疲労で度重なる業務ミスを犯してしまい解雇を言い渡されてしまう。しかしどうしても稼がなければならないと店長に懇願すると、深夜シフト中に性処理業務をこなすという条件を突きつけられる。泣く泣く理不尽な要求を受け入れた怜奈だったが、先輩店員の欲情をも焚きつけてしまい、執拗に爆乳を調教されていくのであった…。