Batman, junto a sus aliados y enemigos, se ve transportado desde la moderna Gotham hasta el Japón feudal. Film animado coproducido entre Japón y EEUU que cuenta con guión de Kazuki Nakashima (Kill La Kill) y diseño de personajes de Takashi Okazaki (Afro Samurai).
Aki isn’t a brave little boy, but he’s dedicated nonetheless to safeguarding his sickly, mute friend Fuyu. They and their little gang live deep underground, in the concrete warrens to which survivors have fled following the eruption of Mt. Fuji. The community is in decline, however, as illness and despair take their toll. Fuyu dreams of the outside world, which he is too frail to ever reach. But what colour is the sky out there?
