墹之上 源十郎

Yuno's grandfather and an influential person in the town.

He adores his granddaughter, Yuno, and also considered the protagonist when he when was a child to be her groom.

Due to some events, he came to dislike the protagonist. Now that he came back for the first time in years, Mamanoue sees him as an enemy.
He is also the school's principal, and tries to expel the protagonist by every means possible...