WindowsあえぎゲーAVG
Main character is a chain restaurant manager. His father makes huge debts with the chain president and dies. Protagonist struggles with repaying the debt, but is unable to do it in time. President says that he can forgive the whole debt if protagonist's sister can satisfy president in one night. He can choose to train and sacrifice his sister or some other girl that is ready to stand in her place.
[From vndbreview]
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