Yoshiragi Kota

The protagonist of the VN, but he doesn't appear that much...
A timid boy who is Ayano's little brother.
His classmates noticed his timid attitude and are bullying him. He doesn't want to worry his beloved sister, so he keeps the bullying a secret.

His weakness is that he is really bad at noticing things, so he might not even know what is happening to Ayano...