Tonari no kaibutsu-kun manga

Tonari no Kaibutsu-kun summary:

My Little Monster targets the relationship between Shizuku Mizutani, who has a lad named Haru Yoshida, who sits next to Shizuku in course but seldom attends school and her strategies for the long run, as well as certainly no interests except in analyzing. After Shizuku is tasked with providing course printouts to Haru's house, she meets with Haru, who promptly greets her as a buddy, beginning their new connection. Nicknamed "dry ice," Shizuku is celebrated as a woman who's emotionless and cool. But when Haru was met by her his innocence and his insufficient knowledge towards human associations touched her. Haru is really tender and kind, though recognized as a violent and uncontrollable creature. It requires considerably more for Shizuku to understand and take her own emotions towards Haru, although Haru promptly declares his love towards Shizuku. Collectively, as 2 beings that are formerly unsocial, they help each other understand the best way to take care of others and make friends.