Kotarou is a calm and reserved sixth grader, studying hard to get into a good school. Once the ever-hyper Misha moves into the apartment next door to his, his life is never the same. Although while she's constantly sticking herself to him, she also makes him a happier person through her love and kindness.

Spoiler

In the manga, it is revealed he has romantic feelings for Misha, and he even confesses to her. He is also 1/8th Demon due Shia being her great-grandmother. To add, he can see spirits, angels and demons of all kinds.