Ōe

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

Saint Saint X'mas Arc
Ōe and Kanagi 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.

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