Joker: One Operation Joker Vol. 1

"Written by Satoshi Miyagawa (Uchuu Senkan Tiramisáu) and illustrated by Keisuke Gotou, this manga finds Batman transformed into a baby following an accidental fall into the same vat of chemicals that turned the Joker into his evil self. Immediately after [the] accident, the Joker finds himself lost without his archnemesis and takes it upon himself to raise baby Bruce Wayne. However, the Joker finds fatherhood to be a lot more difficult than he initially thought"-