Kanagi

is a high school student who attends Saint Ishiyama Academy where she has participated in the school's special event, Saint Saint X'mas, with a fellow high school student named Ōe.

Saint Saint X'mas Arc
Kanagi and Ōe participate in the Saint Saint X'mas competition together where they advance to the Top 16. In the first round, they are selected to go eighth, pairing off against the Izuma-Aoi pairing; ultimately, they end up losing in the first round.

Ōe
Kanagi and Ōe participated together in a Saint Saint X'mas competition on Christmas Eve.

Etymology

 * The surname Kanagi means "gold/metal, money/cash, currency" (金) (kana) and "castle" (城) (ki/gi).