Timid and clumsy Atom has a crush on Mudmee, the girl who sits next to him in class. He despairs when he borrows her eraser and sees she's written the name of another boy—Kongthap—on it. To make matters worse, Kongthap sees his name on the eraser that Atom's holding and thinks Atom has a crush on him!

Aoki has a crush on Hashimoto, the girl in the seat next to him in class. But he despairs when he borrows her eraser and sees she's written the name of another boy—Ida—on it. To make matters more confusing, Ida sees Aoki holding that very eraser and thinks Aoki has a crush on him!