A young woman uses her body as payment for her fiance's enormous debt.
Rena lost her parents when she was in elementary school and was taken into the care of her remote relatives, the Takedas. She now lives with her stepbrother, Yoshiyuki, while she’s happily engaged with her colleague, Masahiko. When Rena and Masahiko go to Yoshiyuki to get his permission to marry, they are told that it’d be given when Masahiko succeeds at work. But Rena soon finds herself in despair when it turns out that some company monies Masahiko has misappropriated for client contracts have disappeared. With a debt of 20 million yen, Masahiko pleads Rena to delve into the world of loan sharks for debt relief. When she does, her hellish life begins.
Rena uses her body as payment for her fiance's enormous debt. She has sex with several men. She also fucks her stepbrother, Yoshiyuki, when he reveals his feelings for her. Her fiance finds out in the end and stabs Yoshiyuki, even when he's quite fine letting other strange men fuck her for his debt.