In "Round One", he is briefly seen on the fairgrounds posing for two girls.
Yatsuhashi and his team are competing in the Vytal Festival tournament, representing Beacon Academy and the kingdom of Vale. After Team CFVY wins their (off-screen) match in the team round of the tournament, Yatsuhashi and Coco Adel are selected to represent them in the doubles round.
Yatsuhashi is among the group of students present at Amity Colosseum at the beginning of this Grimm attack on Vale. His weapon flies to the floating arena in a rocket-propelled locker. After a Giant Nevermore breaks into the stadium, he and Sage Ayana deal a blow that decapitates it, leaving it to evaporate upon death.