Written by Satoshi Miyagawa (Uchuu Senkan Tiramisù) 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 accident, the Joker finds himself lost without his arch-nemesis 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.
The Joker has been mysteriously released from Arkham Asylum, and he's none too happy about what's happened to his Gotham City rackets while he's been away. What follows is a harrowing night of revenge, murder and manic crime as only The Joker can deliver it, as he brutally takes back his stolen assets from the Penguin, the Riddler, Two-Face, Killer Croc and more.
In Gotham City, heinous acts of violence are a daily occurrence. Harley Quinn, forensic psychiatrist and profiler, consults with the GCPD on
their worst cases. But she is fixated on an unsolved murder that haunts her—the night she discovered her roommate’s body marked with the
signature of a notorious serial killer known as The Joker.
Five years later, the case remains unsolved, and a new series of horrific killings has begun. As the murders escalate and the meticulously
constructed crime scenes become more elaborate, Harley’s obsession with finding the depraved psychopath responsible leads her down a
dangerous path. When the past and the present finally collide, Harley has to decide how far she is willing to go—and how many lines she is
willing to cross—to solve these cases once and for all.