Mugen Shinshi: Ryouki-hen

Young detective Mugen Mamiya finds himself forced to tackle a case while cleaning up the mess left by a diabolical doctor’s outrageous, insane inventions! He faces these challenges alongside the super-strong Alucard and the all-purpose robot Agatha II. This long-awaited latest volume in the series blends the edginess of the adult Mamiya with the humor of the younger Mamiya!

(Source: Hayakawa Shobou, translated)