Batman Ninja vs. Yakuza League  

This is a continuation of the story of Batman Ninja. When they return to the present day, they find that Japan is missing and in its place is Hinomoto, an island floating in the sky above Gotham City. Atop it is the Yakuza, a group of powerful individuals who rule without honor or compassion, bearing a striking resemblance to the Justice League. It is now up to Batman and his companions to save Gotham City from their grasp.