In a future where space travel is the norm, Cobra, a notorious rogue with a checkered past, lives a life of leisure and adventure. He possesses a unique weapon, the Psycho-Gun, which is embedded in his left arm and grants him extraordinary combat abilities. Alongside his android partner Lady Armaroid, Cobra drifts through space taking on various odd jobs and enjoying the thrills of intergalactic escapades. One fateful encounter at a bar leads Cobra to the enigmatic bounty hunter Jane Flower, who reveals her quest to find the treasure of the late pirate lord, Captain Nelson. Intrigued by the promise of adventure and wealth, Cobra decides to join her on this daring quest.

As Cobra and Jane set off on their journey, they soon find themselves on the run from the sinister and all-powerful space-pirate guild known as the Guild of Space Pirates. This guild, which has a stranglehold on the galaxy, is desperate to stop anyone from uncovering Captain Nelson's treasure, which contains a secret that could shift the balance of power in the galaxy. Their adventure takes a turn for the dangerous, as they must not only outwit the Guild's relentless minions but also confront the mystery of Jane's true identity and her connection to Captain Nelson's legacy. The duo navigate through treacherous planets and face off against deadly adversaries, slowly unraveling the cosmic mystery that links Jane's destiny to the hidden treasure.