"Two girls dating each other? That's just... unbelievable!"One day, popular high school girl Sakakibara Marika is given an offer of one million yen from her beautiful classmate Fuwa Aya."Sakakibara-san, I will buy you for 10,000 yen a day for 100 days. I'll show you that two girls dating eeach other is possible.""H-Huh?!"From that day onwards, their after school xx time began.