Rin Kanaoya attends Daijuni Middle School and has been friends with Serina Yoshida since their elementary school days. During a second-year basketball game, a throw from Rin accidentally struck Anna Yamada, provoking Serina’s ire due to Anna’s visible distress. Rin later apologized to Anna for the incident.

In their third year, Rin becomes classmates with Anna and Kyotaro Ichikawa. Her enduring friendship with Serina remains a constant in her life, though her personality, motivations, and interactions beyond these events are not expanded upon.

Her participation in spin-offs, films, OVAs, or other official media beyond the main series is not addressed.