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(Blake's POV)
After the events that transpired in the Dungeon with Monica's party, we walked back to the surface after healing their wounded friend. In the way up, the professors and security finally arrived, terrible late as usual. This was obviously intentional.
It was quite clear that there were someone, or some people mixed in between the academy's security system, which were managing all of this and stopping security from reaching the students in time.
And of course, whoever set up that Rat King from being able to become a vessel of a high-ranking demon that could even summon Demonic Gates was also involved with the academy if they were allowed to enter the dungeon…
However, as much as we discussed this with Hasan, he said that nobody kept records of supervisors that entered the dungeon, and that it happened all the time.
Check "The Protagnist's Sister Is Actually the Strongest"!