Saki Shima

She appears from episode 6 of the original work. She is Rin's mother. She appears several times in scenes where Rin is at home, as well as in scenes where Rin departs for school or a trip. When Rin goes somewhere, she also orders souvenirs. Regarding her husband, Hajime, who frequently goes solo camping on his motorcycle, she wishes he would be a bit more settled as a father.

She used to ride a motorcycle herself and has gone touring with her husband, Wataru, and her father, Hajime.