My Little Monster, Tonari no Kaibutsukun, The Monster Next Door, My Neighbor Monster-kun, となりの怪物くん
Tonari no Kaibutsu-kun
Nicknamed "Dry Ice," Shizuku is seen as emotionless and cold by her classmates. When she's tasked with delivering class printouts, she runs into Haru, who immediately decides that they're friends. Shizuku is touched by his innocence and his lack of knowledge towards human relationships.
Though known as a violent and uncontrollable monster, Haru also has a kind and gentle side. He immediately declares his love for Shizuku, but it takes much longer for her to realize and accept her own feelings towards him. Together, the two previously unsocial beings help each other learn how to care for others and make friends.