|Base of Operations||Saint Ishiyama Academy|
|Manga Debut||Chapter 180 (mentioned)|
Saint Saint X'mas ArcEdit
Koyoshi and Yamaka 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 twelfth, pairing off against the Nishizawa-Yonehara pairing; ultimately, they end up losing in the first round.