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!
A class trip to Kyoto brings fun and excitement for the Kita High gang--but mostly confusion for Haruna. Between getting separated from Macharu and dealing with Atsu's declaration of love for her, Haruna's heart is all aflutter. Is Atsu right about him being the better fit for her?