Recently a lot of important documents have been going missing from the Ubuyashiki's house and office in school, everyone suspects it might be a student or a teacher. The documents are extremely important as they hold shares and other financial, enterprise stuff. The Ubuyashikis are now on a higher level of alertness, and they suspect one of the students or staff must be working with Muzan, so that he can gain the upperhand. Amane already suspects Nakime might be part of this, since they're on bad terms right now. Kagaya and Amane has implemented more security measures, changing the locks, giving the teachers different keys and having some teachers stay back to be security guards.

Now is another day of school, just normal school. Every single student are in their form room now, and some teachers are being questioned.