A 5 million debt suddenly befalls on cash-strapped student, Kamijou Yuuki.It's because of his father that he went through many hardships, and he goes to drink in desperation butWhen he comes to, he's on a bed full of 10,000 bills and a half naked man?!After waking up, the man even says "I'll give you the money".Confused, Yuuki escapes and goes home, but he re-encounters the mysterious man, Nao."I'll give you the money, so let's have sex. Think of it as physical labor." Nao says, but what does Yuuki do?