After reading Superman - Secret Identity, I discovered that Kurt Busiek wrote the Batman equivalent called Creature of the Night which showed up in 2020. So of course I checked it out of the library via Hoopla and read it.
Just like the other graphic novel, this one is set in a world where DC Comics exist, and everyone knows that Bruce Wayne is Batman. In fact, growing up, Bruce Wainwright loved Batman and made sure everyone knew about it, even calling a family friend Alfred.
When Wainwright's parents are killed, he gets distraught and somehow a Batman appears to help him out. Over the rest of the graphic novel, we get exposition about the nature of this Batman (which is nothing like the conventional Batman comics) and then we deal with how the real world differs from the easy answers of the Batman comics.
The story falls strictly into the fantasy category. There is no explanation for the Batman that makes sense (unlike even in the official DC comics), though there's some bizarre explanation in the narrative that's unsatisfying to me. There's no deep exploration of Bruce's psyche, and there's no long journey where Bruce gets any ephiphanies. That makes this book a weaker work than Secret Identity, but it was worth reading for a unique take on Batman.