有一家健身房，據說即使是最傻氣的男人，加入後也能練出理想的身材……玲子（Reiko）是這家看似普通的健身房的教練，她用一種秘密的管理方法，讓會員們默默地努力改變自己的身材。她的方法是用美臀當誘餌，讓會員戴上貞操帶，只有達到效果的會員才能獲得射精的「獎勵」。會員們每天都夢想著射精，並堅持在健身房裡訓練…
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