Koko Shuzen (朱染 心愛 Shuzen Koko?, Anime: Kokoa Shuzen)[3][9][note 3] is Moka Akashiya's younger sister, and the youngest of the four Shuzen sisters;[9] she becomes a student at Yokai Academy in the second manga serialization and anime season. She has a pet bat that can transform into a variety of weapons.[S2 ch 3][S2 v2] As a child, Koko regularly fought Moka, but always lost. Upset that Moka sealed her powers, Koko enrolls in Yokai Academy to be with her, picking fights with her in order to draw out her inner personality.[S2 ch 3-4] She also dislikes that her sister and the girls fawn over Tsukune, and refuses to be associated with the harem,[S2 ch 5][S2 ch 17] although after they save her against the Karate Club, she joins the Newspaper Club.[S2 ch 8] In the Season II epilogue bonus comics, she and Haiji Miyamoto officially go out, but their outings end up being non-romantic sparring sessions.[S2 v14 extras] In the original Japanese anime, she is voiced by Chiwa Saitō. In the English dub, her name is spelled Kokoa and pronounced with the ending -ah sound; she is voiced by Kira Vincent-Davis.[S2 ep 1 credits]
