Moriyama

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, Seta.

Saint Saint X'mas Arc
Moriyama and Seta 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 fifteenth, pairing off against the Ujie-Akishige pairing; ultimately, they end up losing in the first round.

Seta
Moriyama and Seta participated together in a Saint Saint X'mas competition on Christmas Eve.