Well, it turns out you DO need PS+, even if the game doesn’t even use Sony’s servers. I did end up getting a two-day trial of PS+ though, and I used it for REVELATOR.
I immediately got Rank 13 after my 10 matches. Not sure how high that is, but considering I was fighting some Rank 7 or 8s, it’s probably not too bad.
I really want to get better at this game. I need to record all of my matches and learn from the ones I lose in. This game is too good for NOT learning to be better!
And of course, I should get a PS+ year subscription.