Rin Kagawa is a junior (kouhai) of Tanaka Ayumu, Kakuryuu Takeru and Mikage Sakurako. She attends the same middle school as all of her seniors, and also in high school. She was in the former Kendo Club in middle school and joins the Shogi club due to following Ayumu's steps. She loves to compete in any competition especially Shogi and Kendo with her senpais, especially Ayumu and Takeru.

Spoiler

She is in love with Ayumu but she will only confess to him when she lands a point on him in Kendo.

Spoiler

Even though she loves Ayumu she helps Ayumu to get better in shogi so that he can defeat Urushi and confess to her