My Little Monster

My Little Monster (となりの怪物くん,Tonari no Kaibutsu-kun, lit. "The Monster Sitting Beside Me") is a Japanese manga written and illustrated by Robico. It was serialized in Kodansha's Dessert magazine from August 23, 2008 to June 24, 2013. An anime adaptation by Brain's Base aired from October 1 to December 24, 2012. It was also simulcast on Crunchyroll.

Plot
Mizutani Shizuku is the type of person who only cares for her own grades. But when she accidentally delivers lesson notes to Yoshida Haru, he becomes convinced they are friends.

Haru turns out to have a very innocent personality, but who would've thought that Haru would actually confess to Shizuku?

A cold-hearted girl and super-troublemaker romance with a fresh new perspective.