Naughty little horse jump series: enemy at the same table

"Lu Manman, Ma Xiaotiao's deskmate and also his 'enemy', is the squadron leader in his class and is assigned by teacher Qin to discipline Ma Xiaotiao. She has a little notebook and records all the bad things Ma Xiaotiao does. There is 'war' happening between them everyday. But when Lu Manman runs for the battalion chief in the school, Ma Xiaotiao does his best to pull votes for her. And when Lu Manman is sick, her sickness goes away when she sees Ma Xiaotiao."--Amazon.com.