Haruna Aizawa thinks that school life is just like a monkey mountain--all the monkeys form cliques, get into fights, and get back together again. The school that she just transferred to is no exception. There's even a boy called Macharu Yamashita who reminds her of a baby monkey!
It's hard enough fitting in at a new school while dealing with family problems... Will Haruna remain jaded and distance herself from everyone around her? Or will Masaru win her over with his monkey magic?