Ninja Batman tai Yakuza League

After Batman and his allies return from feudal Japan to the modern world, they discover that reality has changed in an impossible way: Japan has vanished, and an enormous island called Hinomoto now floats above Gotham City.

The island is ruled by superpowered yakuza whose faces and abilities resemble members of the Justice League, but who behave nothing like the heroes Batman remembers. With Gotham threatened by a force whose origin makes no sense, Batman, Robin, Nightwing, Red Hood, and Red Robin must reunite to learn what happened to the Justice League and how Japan became a floating criminal kingdom.