Rin has been friends with Koizumi Hanayo since they were children. She is very energetic and likes to play sports. As a child, she was teased for wearing skirts. Because of this, she decided to avoid wearing skirts and dresses in public.

Personality:

 Rin appears to be a bit of a tomboy. She mostly teases Koizumi Hanayo, her best friend, and appears to be with her most of the time. She is very energetic, sporty and active, and has attempted to hug every member of µ's. Her personality is similar to Kousaka Honoka's because they are both determined and hard-working.