The leading lady here is a girl called Ume-chan. That isn’t her first name, it’s actually a nickname based on her last name, Umehara. I won’t say what her first name is, because it’s kind of funny, and it’s sort of a surprise in the scene where it’s first revealed. Anyway, Ume-chan is suffering from an unrequited crush on a boy in her class. His name is ISEZAKI-kun. He sits directly in front of her, and she spends a lot of her time observing him and writing down her thoughts in a little notebook devoted entirely to him. Ume is fairly comfortable with her situation of loving him from afar (well, from one seat behind). After all, there is no hope for her. Isezaki-kun has a girlfriend who is pretty and nice, and practically perfect. He seems to really like her. So Ume spends her time writing about him instead.