Leiji Matsumoto
is a 1972 manga by Leiji Matsumoto. It introduces Tochiro Oyama, best friend to Matsumoto's classic hero, Captain Harlock, who is in turn depicted as a gunslinger in the Old West. In sharp contrast to other Matsumoto's stories, "Gun Frontier" is a comedy adventure rather than a space opera. Also, unlike other Harlock stories, in "Gun Frontier", Harlock is depicted as Tochiro's sidekick.