Mirror (ミラー?) was a student of Majisuka Jyogakuen as a member of Sakura's Rappapa before joining Sakura on their attempt to save their school from being closed down. She was given the Genji Name Kisu (キス kissing gourami?) in Cabasuka Gakuen in which her surname was also revealed to be Kojina.
- Mirror's actress, Kojina Yui, previously portrayed another character from Majisuka Gakuen 0 named Narushi. Although up to this date, there is still no possible evidence of the two's relationship in the series aside from they are affiliated both with Miyawaki Sakura, Katsuzetsu, Sashihara Rino, and Bouyomi.