"It's impossible for girls to be together! ...Or so I thought!!" One day, the popular high school girl Sakakibara Marika was suddenly approached by her cool classmate, the beautiful girl Fuwa Aya, who handed her 1 million yen. "Sakakibara-san. I will buy you for 10,000 yen a day for 100 days. I’ll test whether girls really can’t be together." "--What? What?!" Thus begins the after-school ○○ time starting from that day. Aya's actions, which began with gently petting Marika's head and holding hands, gradually escalate day by day!! Will Marika be able to claim "It's impossible" to Aya on the 100th day?? (She can't). Is surrender certain?! Is defeat guaranteed?! A girls' love comedy surrounding Marika's 100 days!