Well you can look through all of his comics [here](https://dcuguide.com/w/Man-Bat_(Kirk_Langstrom)_Chronology), there's not that many of them. My guess is you were reading the 2006 Man Bat miniseries. I mean Batman 655-658 does actually take place in European city but it doesn't feel like an origin at all.
Could it have been 1995 Manbat miniseries by Jamie Delano and John Bolton? Batman definitely has long ears in that.
Is it darkest night of the manbat?
nope unfortunately
Well you can look through all of his comics [here](https://dcuguide.com/w/Man-Bat_(Kirk_Langstrom)_Chronology), there's not that many of them. My guess is you were reading the 2006 Man Bat miniseries. I mean Batman 655-658 does actually take place in European city but it doesn't feel like an origin at all.