This has a very similar problem to Phantom Brave, interesting idea, but grinding in it sucks ass and ruins the pacing that I couldn't even fully finish it and just looked up the plot online to not go through the grind myself. Basically your "units" are SQUADS of units and each unit has a specific type of action it can take depending on if its the front, middle, or backline in a 3x3 grid and you assign a leader who grants certain special abilities (like buffing the squad for a number of turns). A squad dies when all units it in are dead or the leader dies (I forget which). The problem is, this means you have to kill so many more units to remove a unit on the map and the game doesn't adequately compensate for this imo. Disgaea maps can take me a minute at most when I knew where to grind,
Soul Nomad/Phantom Brave could take me multiple minutes and that really adds up as you're trying to level newer generic unit types as you unlock them (who are always initially underleveled). Basically think of FFTactics, only FFTactics takes about 3 times longer to train your new recruits, you need more units overall, AND you will likely make newer units as you get new class types. That's PB/SN in a nutshell when it comes to how their grind feels, cool if albeit autistic systems, but extremely annoying to go through unless you have to autistic stomach for it.
Also you have to make a squad in a "room", a room is effectively an rng 3x3 block that can give you 4 slots or around 7-8 (I don't know if 9 is possible), and each room iirc has its own little additional effect while also having the tiles be random. So if you want bigger squads you need 7-8 tile rooms, but that takes a good amount of rerolling rooms which is repetitive. The game has a cool idea, but its design choices just fuck with the pacing.
Plot wise: Soul Nomad is more "out there". Basically your sword is possessed by a sealed but extremely powerful dark god, and he is an absolutely cocky asshole who says shit like this.
He is very entertaining, but the rest of the plot is just...okay it is 100% carried by Gig's antics and mouth among a few other gags here and there. You can be very very legitimately evil in a route split early on, BUT you need very high levels to complete that route so you're pigeonholed to be good on your first playthrough which is the canonical route that actually explains what's going on, the demon route is effectively a big "what-if" where you very legitimately fuck everything up.