I've only read the first chapter of One Operation Joker (which is the only one that released) and oh boy. American comic books fan are in for an absolute treat. It's funny, it's beautifully drawn and it takes us to parts of Joker's personnality which I never thought we'd see someday. I mean, Joker trying to be a good dad to Batman, WHO THOUGHT IT'LL HAPPEN SOMEDAY. It's very good. The first chapter really hooked me and I'm looking forward to more soon :)
Big shout out to Gotou Seisuke for the art, it's amazing and realistic even with the tone of the series. I really think this series could blow up if enough people take it in consideration.