"Vandread 2nd Stage" continues the narrative of the original "Vandread" series, expanding on the conflicts and relationships established in the first season. The story picks up with the crew of the Nirvana, a unique battleship formed from the merging of male and female spacecraft, as they journey toward Earth. The Nirvana is crewed by a mix of men from the planet Tarak and women from the planet Mejere, two societies that have been at war for generations. The series explores their evolving dynamics as they learn to coexist and work together.

The central characters include Hibiki Tokai, a young mechanic from Tarak, and Dita Liebely, a spirited pilot from Mejere. Their relationship, along with those of other key characters like Meia Gisborn, Jura Basil Elden, and Barnette Orangello, forms the emotional core of the series. As the Nirvana travels closer to Earth, the crew faces escalating threats from the Harvesters, mysterious mechanical beings that harvest planets for resources. The Harvesters are revealed to be connected to Earth's past, and their true nature becomes a central mystery.

The narrative delves deeper into the origins of the conflict between Tarak and Mejere, uncovering secrets about their shared history and the role of Earth in their division. The crew discovers that Earth's society has deteriorated, and its leaders have been manipulating both planets for their own purposes. This revelation forces the crew to confront their preconceptions and unite against a common enemy.

Throughout the series, the characters grapple with personal growth, trust, and the challenges of forging a new future. The action sequences, driven by the Vandread mecha units, are interspersed with moments of introspection and camaraderie. The story builds toward a climactic confrontation with the Harvesters and Earth's forces, culminating in a resolution that emphasizes unity and hope for a better future. The series balances its sci-fi action with themes of cooperation, identity, and overcoming prejudice, making it a compelling continuation of the "Vandread" saga.