Rin is a competent swordswoman and a member of the Kamishiro branch family. Rin has a reserved and dignified personality and always dresses in a samurai-style kimono that is suitable to her warrior nature. Rin is ordered by the head family to secure Kazuki's genes in order to ensure the Kamishiro family's dominance, which according to Kuriko, has been weakening because of the number of branch families.