Can take place in both ss or rq.
Although rq would make more sense.
Sabre is part of a cult that summons and worships demons and the steve's are demons.
One day sabre makes a summoning ritual but it fails and he accidentally makes a portal to the demon realm.
There he's met with the steve demons.
So basically red steve, blue steve, yellow-green-orange-rainbow steves
All of those!!!
But they're demons!!!
I'd imagine sabre being extremely respectful to the steve's and even doing anything they ask of him.
Most steve's are actually very nice but some try to take advantage of sabre's worshiping.