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|Affiliated:||Tanabo, Mihoshi Tachibana(Friend) Kenzaburou Daiku(Possible brother)|
Sumika is a middle school student who met Yuuko in Chapter 112 of the manga, and is a classmate of Mihoshi Tachibana. Although she is seen only in the manga, Sumika makes a cameo appearance in the second ending along with Tanabo. Her parents are known to have a considerable amount of wealth which implies she is the younger sister of Kenzaburou Daiku. If so, this would mean that her last name is also most likely Daiku. In Chapter 136, she mentions that she has an older brother who's into some sport where people can die (ie, Igo Soccer).
|Trio Sucharaka||Mio Naganohara · Yuuko Aioi · Mai Minakami|
|Shinonome Laboratory||Hakase (Shinonome) · Nano Shinonome · Sakamoto · Biscuit 2|
|Faculty||Principal Shinonome · Kousuke Oura · Izumi Sakurai · Manabu Takasaki · Kana Nakamura · Tomioka · Akagi|
|Class 1-O||Yuria Sekiguchi · Makoto Sakurai|
|Class 1-Q||Mio Naganohara · Yuuko Aioi · Mai Minakami · Nano Shinonome · Haruna Annaka · Tanaka · Tsuyoshi Nakanojou · Ogo · Midori Ōmama|
|Class 2-P||Kenzaburou Daiku · Koujirou Sasahara · Misato Tachibana · Weboshii · Fe-chan|
|Fey Kingdom||King Albert · Princess Starla · Dolph · Fey Kingdom Soldiers|
|Others (females)||Yoshino Naganohara · Tamamura · Mihoshi Tachibana · Sumika · Tanabo · Kimiko · Yuuko's Mother · Double Cheeseburgirl|
|Others (males)||Hajime Sakurai · Mi-chan · Nakanojou's Father · Assistant Instructor · Gentleman · Kiyoshi · Policeman · Hirose|
|Others (animals)||Buddy · Karasu · Oguri Cap . Pyon · Kojirou · The deer|