Space Adventure Cobra

Cobra, a famous space pirate with a psycho-gun hidden in his left arm, supposed dead for two years, is back in action. He falls for bounty huntress Jane Flower, whom crime lord Necron wants dead, and tries to help her save her world.
Cobra, a notorious space pirate, is enlisted by bounty hunter Jane to rescue her sister from the strange being known as Crystal Bowie, but then finds himself drawn into a complex struggle over the fate of a mysterious wandering planet.