Stratos 4 Recap episode - For everything which happened before Stratos 4 Advance started.

The OVA will be focus on when Kujaku Nijou first entering group, which occurs one year before the main anime begins.

Meek salaryman Johnson discovers that he is in fact the notorious (and reportedly dead) space pirate Cobra, with a new face and altered memories. Embedded in his left arm is Cobra's unique Psychogun, a famous weapon powered by his own will. Having recovered his past, his partner-in-crime Armaroid Lady, and his spaceship, he journeys across the galaxy seeking adventure. On his travels he will hunt for the galaxy's ultimate weapon, rob museums, break into and out of maximum-security prison, infiltrate a drug ring in the brutal and deadly sport of Rugball, engineer a coup on an alien world, confront the Pirate Guild's most fearsome leaders, and do much else besides—smoking cigars, chasing women and cracking jokes all the while. This, the 1982–83 Cobra TV anime, adapts the Cobra manga from the beginning, covering the first three major stories and building to a grand conclusion with some shorter one-off tales interspersed along the way. (The 1982 Cobra film has only a loose connection to the TV series—though it involved the same director and some of the same animators.)

In the future, an organization called the GGP has taken control of the world. Rin Ogata was a promising up-and-coming ballet dancer, but suffered a serious injury while dancing and decided to quit. Years later in college, she comes across a club building and soon finds herself intrigued by a transforming motorcycle-like robotic vehicle called a "Rideback". She soon finds that her unique ballet skills with balance and finesse make her a born natural on a Rideback. However, those same skills also get her into serious trouble with the government. (Source: Wikipedia)