Synopsis
In a future era, a European metropolis sprawls deep underground, concealing hidden, ominous levels that hold the secrets of history. Former assassin Mihai has come back to live with Kiri, who now operates a restaurant. Alongside them are Naoto, who wields a sword, Haine—a mysterious individual with white hair resulting from genetic engineering—and Badou, who sports an eyepatch and serves as Haine’s occasional partner.