It's on my list. Got quite the backlog on Vita now. Still haven't finished Persona yet

At over 70 hours and just beat Heaven. Know there's still quite a bit left
You're close to a very important point in the game. Save the game when it asks you. Make your choices right as the wrong choices can make the game go in a different direction that will end leaving you scratching your head and unfulfilled. It happened to me first time and I was dumbfounded as I thought it ended unsatisfyingly..
I'd say
don't look for a guide as it'll probably contain a spoiler(I was slightly spoiled.. but that wasn't all of it.)
I'll say spoiler free, when you're talking with the group you'll be asked some questions.
Choose these options in this order:
--> Pick the third option
--> Pick the first option
--> Pick the third option
--> Pick the second option
--> Pick the third option
--> Pick the second option
Then a while later you'll be presented with a list of people. Choose the correct one after thinking about it.
Wrong one will get you a bad ending.
Make sure you have maxed out one social link at first. Also if you maxed out Marie's social link you can unlock a special dungeon for her that also requires completion if you want an extended ending.
Also near the "end" of the game just keep pushing and don't take the easy route. The game can also end "normal" leaving you out of another revelation and a true golden ending. Game did a nice job of keeping shyt out in plain sight.