What would it be like if Superman was still Superman, Clark Kent or even Kal-El, but Batman was no longer Batman but just Bruce Wayne.
It's probably a story about how [the old man lost his identity as Batman (it's up to you) and how he ate, drank and fought monsters with his old gay friends].
I was addicted to ancient comics, so the relationship setting between super bats in the past was closer to the "best friends and partners" in the Silver Age. It was not the most common relationship of "mutual respect but disagreement, and the agreement to not infringe each other's territory and occasionally dislike each other."
And anyway, there are always some things that I put together randomly, but I tried my best not to overdo it. The anime universe and the comic universe are probably mixed together. I have a bad brain and a poor memory and a lack of strict research. Please feel free to slap me [Stretch your head and hit me]