Aoki is a high school student with a bright personality. He has a crush on Hashimoto Mio, the girl who sits next to him in class. But he gets desperate when one day he asks to borrow his eraser and sees that he has “Ida ♡” written on it. Ida is the name of another classmate. Aoki then assumes that Hashimoto likes Ida. To make things more confusing, Ida sees Aoki holding that same eraser and thinks that Aoki has a crush on him.