Asa begging Denji not to bring up cats shows that she doesn't really want to give it all up, not really. Yes, "falling" would be the solution to all her problems likely (no more pain, not having to think about the memories and guilt, no more hurting anyone) but she wants to listen to Denji and be convinced out of it. (Or maybe it's simply that remembering Crambon is too painful for her.)
I think I know what the one thing she wants to do "with even just one person" is but I can't be sure...
And Yoru, right? She's on the ground while Asa is floating up? I've had this theory for a while, but I don't think she's "just" as much of a hallucination as she had us think she is. What if Asa falls through a door to hell, and Yoru gets stranded on earth with no body? If Asa dies in hell, does Yoru get reborn there or on earth or not reborn at all?
Lastly, shoutout to that person who shared an analysis that Denji and Asa cope in different ways, where Asa gets deeply unhappy when she's in any kind of physical pain or discomfort and retreats to her thoughts and Denji literally breaks his skull open to avoid thinking. You were right on the money.