Vandread: The Second Stage

Life sucks for Hibiki. Intergalactic society has broken into civil war between males and females; he's stuck on the assembly line for war mecha, relentlessly teased by his co-workers and unable to pursue his dreams of building his own mecha one day. He finally decides he's had enough though, and attempts to break in and steal a mech for his own purposes; this turns out to be a bad idea, thrusting him into the middle of a fever-pitch space battle that brings him face to face with the enemy and launches him into an adventure that will change his mundane life forever.

Vandread Gekitouhen (Vandread Turbulence), similiar to Vandread Taidouhen, is an OVA summary of Vandread the Second Stage plus several extra scenes

Vandread The First Stage (season one) was immediately followed up by this TV special. This TV special, also known as Vandread Taidouhen Stage (The Movement Stage) was a recap of the first 13 episodes with additional footage. So, Vandread Taidouhen is not really a bridge between Vandread The First Stage and Vandread The Second Stage (season two). It was made to bring new viewers up to date as to what happened during the first season

True Calendar (T.C.) 71 - A new age where 70% of the human population lives in space thanks to the development of "Dyson Sphere", a city in space. The world is divided into two main powers: The Dorssia Military Pact Federation, a power which grew out of a military alliance, and the Atlantic Rim United States (ARUS), which grew in power as it expanded its trade agreements. The minor nation of JIOR has declared neutrality between these two forces and maintains its peace through economic prosperity. Within the JIOR's Sphere, Haruto Tokishima lived an ordinary life as a high school student in the division known as "Module 77"—until the Dorssian military begins their sudden invasion! But the whole world will be shaken when Haruto meets the mysterious humanoid weapon, Valvrave!