The treasurer of the Student Council, a friend of Soujuurou from a previous part-time job and classmate of him and Aoko.
Though her father disapproves of her desire to attend college, Kojika still works hard to save money to attend anyways.
She possesses a cool-mannered and realistic personality. She is very responsible as a result of being in charge of a household of brothers. She dislikes how the men in her life look down on her and hates animals. She has a one sided crush on Tobimaru.
| Main characters: Aoko Aozaki • Alice Kuonji • Soujuurou Shizuki|
Secondary characters: Touko Aozaki • Lugh Beowulf • Tobimaru Tsukiji • Kojika Kumari • Housuke Kinomi • Yuika Suse • Ritsuka Suse • Eiri Fumizuka • Kazuki Yamashiro • Yurihiko Tokitsu • May Riddell Archelot