Araki Rina

Protagonist's sister-in law.

Has a frank attitude and unyielding spirit. Doesn't also like to lose. A character who cannot be honest.

Is very good at household chores and does fair well in studies too.

In both literary and martial arts, is admired by men and women alike.

The protagonist and his father welcomed her in the Araki household and started living with her in the same household.

During her childhood, after a quarrel, ran away from home towards hill at the back of her home. After being helped by the protagonist there, fell in love with him.