the premise is Batman fell into a chemical tank while Joker and Batman were fighting and turned into a baby. HA HA (This was paralel with how Joker was created.) Joker decided to raise Batbaby to become Batman. Afterall what is a villain without his archenemy. The Manga was all about Joker's struggle as a single RESPOSIBLE parent... HA HA the stuations were so absurt and some of them were really hilarious. This is probably the most absurt manga, i have ever read. All the American characters were acting with Japanese mannerism really took the absurdty level up a notch as well. The Panels which werescenes from The Dark Knight film and Joker film were well pulled off, they were hilarious. Harley Quinn had a big part in the story as well. It was really fun to see a Joker with Nolan Films vibes (especially design vise) with Harley Quinn. They really worked together well in the manga. Batman is my favorite American Comics Character and i really enjoyed this manga. It is a very short read as well, only 21 chapters.