The series centers on the notorious space pirate Cobra, who was once compelled to evade his enemies by surgically altering his face and erasing his own memory. At the beginning of the story, he is living an ordinary life, but after using a dream machine, he begins to recover his memories. Reunited with his android partner Lady Armaroid and his former ship Tortuga, he now confronts both old and new adversaries. The first and most famous manga storyline involves him encountering the Royal sisters, whose bodies contain the map to a vast treasure.