I've finished the game! And wow, what an ending. I'll spoiler tag it, because of obviously heavy spoilers.

The Ending
Like, I'm so angry right now. The Main Character dies! Now I did some reading about 'The Answer', the sort of epilogue of the game. And apparently, the MC isn't dead, but a massive barrier to prevent Nyx from touching Erebus, the manifestation of humanities's grief. I'm really rather upset she had to provide a seal.

I mean, I understand the thematics of it and it is a really compelling ending to the story, but...

Ugh, I really wanted everyone to be happy. That last day in March where everyone remembered again, only for you to fall asleep (I'm guessing she was living on borrowed time at that point? The ending didn't really make it clear) was saddening.

I really hope Persona 4 Golden has a happier time of it.