I've been following this one on his ci-en for a long while now and from the gameplay demos I have to say, if you're familiar with Fate: Grand Order, you have the gist of how the gameplay for this one works.
There are 3 card types (red/green/blue) which have different effects when used (red deals more damage, green generates crit chance for the next turn, blue generates mp.) Each girl has a "deck" of 5 cards with set colours (e.g. claw girl has a triple red deck) and at the start of each turn, you draw a hand of 5 cards from all 3 girls' collective decks, choose 3 cards to play (they go in the order you click them) and then watch the turn play out.
Each girl has a skill you can use on your turn at the cost of mp, with mp doubling as your ability to resist/break free of grabs (so be careful about how much you spend, or don't if you want to see h-content) and when a girl gets grabbed, each card she plays has a chance to break out of the grab, but she'll take mp damage for using it. If this mp damage reduces her bar to 0, she cums and gets tied up, which makes her stop drawing cards alltogether and gives her 3 new skill to struggle/endure/succumb(?) and if she runs out of health while bound, she gets captured a-la asagi.
Noble Phantasm, or ultimate skills, or whatever you want to call them, are also a thing, though I have no idea what actually triggers them. They show up as extra cards above your hand that persist between turns and even battles so you can charge them once and then save them for when you need a clutch play. Each one acts as a massive swing move, so be aware of that.
Crit works on a generation system where you'll generate critical "stars" with your attacks/abilities, which are then assigned to the cards in your hand; more stars on the same card means that card has a better chance to crit. There also seems to be an inverse of this mechanic where enemies generate hearts that attach to your cards, but I'm not sure what it does yet. Some kind of lust buildup, maybe?
There's walking around and exploring, dialogue and events just like any other ahriman game, lots of heavy bondage, anal training, all the good stuff we've been missing since asagi.
All told, I'm looking forward to this one.
EDIT: Sidenote, but you can very clearly see the FGO influence in this one, I mean the title character is literally just a hornier BB