Played this game since yesterday, and I'm now at Rank 15, and here are my thoughts. Wouldn't be able to say anything about the story since I don't fully understand Japanese.
Graphics & Art 4/5: Gameplay-wise, it's a motion 2D animation, similar to Fate/Grand Order. outside of that, the art is amazing, and the colours are vibrant and lively.
Gameplay & mechanics 4/5: It's basically turn-based RPG with their own unique mechanics. There's the elements, with every character, called Knocker-Ups, as well as the enemies. You have your Normal Attack + 2 Skills (they have cooldowns in turns, much like F/GO) and another skill can be equipped thru cards (more info on Astral Records below). Exploiting elemental weaknesses of every enemy is a must, since it deals more damage, and it will also fill the "DOWN" Meter of the enemies which, if you manage to fill it, will knock down the enemy (mostly applies to Elite enemies and Bosses), making it miss its turn, and be more susceptible to damage. That's everything for now. Start a new game?