|Full Name||Tsutsumi Kotona|
|School|| Fifth High School |
|Ability Name||Silent Veil|
|Novel||Volume 16, Chapter 5|
Kotona also attended Fifth High School with him and faked her age in order to to match his. Katsuhige sees her as more than a Guardian and asks Yotsuba Maya, the current head of the Yotsuba Family, for permission to marry her. Their engagement was announced at the family's Annual New Year's Celebration/Meeting.
Kotona opened her eyes wide in shock and was speechless, when hearing Katsuhige talk about how Tatsuya killed a 30 year old battle magician when he was just 6 years old. In a duel between Guardians, she was defeated by Tatsuya.
She tells Kanata to stop provoking Yuuka and to know his place as a Guardian by not delivering shame to Katsuhige. In a fight with her and Kanata against Tatsuya, ultimately ended with her defeat and her brother trying to protect her by firing of Phonon Maser when Tatsuya grabs her neck.