Transported, along with his allies and all of Arkham Asylum’s inmates, to what appears to be feudal Japan by one of Gorilla Grodd’s contraptions, Batman must find a way to both untangle the mess history has become and return to the modern day.
An action movie with both martial arts and mecha action along with a bit of comic relief in the form of the Joker and Harley’s personality. Be aware that it requires some basic knowledge of the Batman franchise to understand the character dynamics and that the English script differs significantly from the original Japanese version.
More Information:
aniDB
Wikipedia