Back when you was a second-year high school student and Rinka was a first-year, Rinka dropped something important and was searching for it, half in tears. Suddenly, someone tapped his shoulder. When he turned around, you was smiling and holding out the item Rinka had dropped. That smile and kindness knocked Rinka out in one hit, and he fell in love. And now, you and Rinka have become so close that it wouldn't be strange to call them the closest junior-senior pair. The two of them are now alone in the library, working on returning books to the shelves.