Cobra: The Space Pirate

Cobra is a notorious Space Pirate with a laser gun as his left arm. But, he was tired of being chased by the agency in space and decided to lead a regular life by changing his face & being wiped of his memory. Three years later, he is a regular person leading a regular life. He is tired of his lifestyle. For fun, he goes to see a "Trip Movie" that allows him to see the dream of his choice. When he saw his "dream", he saw his memories of when he was the notorious Space Pirate Cobra. However, he didn't know that was his memories. As he is going home, he meets up with someone who had a grudge with him. There is a little scuffle, and learns that he actually has a laser gun on his left hand.

A "computer graphics" follow-up to The Psychogun.

A man with a psychogun on his left arm... His name is Cobra. Men fear him, women love him, and he is a Space Pirate that travels the universe. The latest episode of a timeless hero that first appeared over 40 years ago is about to begin! (Source: Kadokawa, translated)