Read it official: VIZ or MANGA Plus. Chapter 80 is “Secret Room.” Chapter 79 is “Threat!!” Chapter 81 is “Core.” The hotel fight is already Banquet and Play. Samura is already an Owl problem because two Enchanted Blades occupy one city.
A room that was supposed to hold
This site’s hotel page and the Play essay already treat the Kyoto Bloodshed Hotel as a building that comes apart when the wielder does not respect furniture. A secret room in that week is still architecture under a banquet sword. We do not invent who is behind which door. We file the title next to the hotel and the Enten-versus-Tobimune duel that Volume 9 is walking toward.
File: hotel, Banquet, Enten vs Tobimune.