Yamamoto-san from Next Door Episode 2

Suspicious about not being happy that Ayumi gives Mamoru cookies for saving her, his friend Kusuda questions him about being in love. After Mamoru shows him the girl which he likes , who is actually in high school, they both go to Mamoru's home. There the neighbor girl from next door comes through his window. It turns out to be Misaki Yamamoto, the girl he loves. But unfortunately she only sees him as a childhood friend--no, as a younger brother.