After the Demon Invasion on the Academy, the students were taken to safe zones within the premises.
Since these 'shelters' were made before the Class System was implemented, there weren't separate spots for those of different standing. As a result, even if it was only temporary, the students enjoyed equal treatment.
Naturally, the boys' residence would be different from the girls', so two large faculties served the purpose of an emergency shelter.
These shelters were underground, but they were not uncomfortable.
The cooling system was fully functional, and luminous stones made it easy to see. It wasn't much different from being in a building above ground. However, despite the amenities provided for the students, there were a few unexpected things.
Four people were assigned per room, and they would also share a bathroom and toilet. This came as a shocker to a lot of nobles and rich folk who had never shared their sleeping space with anyone—much less a place they bathed in.