Rino Kinosaki is a Doberman. She is 3 years and 5 months old.

Among the three girls who used to be dogs, Rino is the only one who doesn't consider Yuichiro her "master". Rather, Yuichiro's father is the one who is in the receiving end of Rino's affections. The reason for this is that Yuichiro's father took in Rino after she had been abandoned in a park by her former owner, where she eventually grew distrustful of humans.

Rino is the most protective of the three, constantly looking after the others or making sure Yuichiro does. She has a rather curt and direct manner of behavior, though she remains calm most of the time.