Hoshigawa Kurumi has a crush her classmate, Nikaidou Nika, who sits in front of her in class. She's popular with guys so she has no trouble going from boyfriend to boyfriend. One day, Nikaidou borrows an eraser from Hoshigawa.

After being hospitalized, Sana, meets a mysterious girl at the vending machine named Kousaka Ayane. They are both interested in each other and start spending time in their rooms. With every meeting Sana experiences new emotions which she hasn't felt before. After Ayane's doctor tells her that she is going to leave hospital she meets Sana one more time...