At least it’s not a Drifting Classroom reference. Right…?
Episode 85: 時空教室 – Jikū Kyōshitsu
Yuhi and others wake up in an unfamiliar classroom. Gathered in there are the 39 people who have realized the truth about the Kuaidul Spacetime. Meanwhile, Yudias and Kuaidul are outside the classroom. The two of them begin a Duel, with the freedom of the 39 people trapped in the classroom at stake!
Script: 野村祐一 || Nomura Yuichi
Storyboard: ワタナベシンイチ || Watanabe Shinichi
Direction: 西村大樹 || Nishimura Daiki