Three thoughts immediately come to mind:

1: The game doesn’t exactly have the strongest of main plots. There’s good stuff in there, sure, but its more like a series of really entertaining episodes with their own arcs and themes, collected together and put in a single game (oh, uh, and with a Giant Space Flea From Nowhere style final act).

Adaptation is not a simple process, and Persona 5, just on a structural level, isn’t something that’s going to be easy to adapt. Sure, a lot of the game’s runtime is faffing about in the real world and doing dungeons, but even the main cast of Phantom Thieves is probably going to have to be pared down a bit, almost certainly dropping Haru and putting Futaba, Makoto and Yusuke on the bubble for removal/combination.

2: Almost as hard is going to be the visual portrayal of it all. The art design of Persona 5 is at least as important for the game as the actual writing is, really leaning heavily on the possibilities afforded by animation.

I wonder if the best way to do it would be like how they adapted The Lion King to the stage: Lean into the “there’s no way we can accurately portray all of that craziness” and go with a style that’s more metaphorical and symbolic.

3: The hardest thing is including the Dickmobile monster somehow. I mean, if you can nail that down, everything else is going to look simple by comparison >_>.