Wait, spoilers for if you haven't gotten some of the endings, like, all of them.
Can there be a happy ending? Like, maybe a second game ending perhaps? Where the second game takes place after Ending 12, where you choose to leave the simulation using Ash's Progenitor, but, because your in a completely new place, you are reset to being completely normal, without anything, not even the Gun-blade, so you have to forge for new everything, basically starting at square 1 again, but with all the knowledge from the first game, also being able to transfer data from the first game over. There's a lot you can do. But it would still be your game, so you decide.