What kind of combat system would r9k enjoy in a somewhat grindy

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What kind of combat system would r9k enjoy in a somewhat grindy sandbox erpg?
To give some more context:
I am literally a neet for the year and one of my friends wanted to make a game so we decided to work on one because why not at least there's something to do with my time.
The basic idea is a visual novel (porn) with emphasis on gameplay so multiplayer is out of question.
The grind wouldn't be as bad of course as in a mmorpg.
I was thinking about something similar to monster hunter where you aren't just farming xp but different ingredients too so you kind of have an objective.
I'll list the main problems we had with combat systems.
Sooooo.. since it's a porn game you should ofc have your anime babes at hand, but working companions into combat is something that's hard to do with non turned based games.
With turn based combat systems our problems were with depth.
So you want to have something simple for grinding, but you want something in-depth for normal fights and this is where i disagreed with the guy i'm making the game with.

I sided with usual jrpg style combat systems like in ffx or persona with some statisfying skill checks or whatever like the ring thing in shadow hearts while he wanted something like in heroes or wakfu since there's somewhat more you can do with those systems.
Also this time stop western style combat system like in baldur's gate came up too.

We are focusing on the combat system for now but feel free to give ideas not concerning the combat systems too.