Starship Girl Yamamoto Yohko

In the year 2999 AD, two factions—TERRA and NESS—are fighting it out in space for control of worlds. They engage in combat using spacecraft that, when destroyed, transfer their pilots back to the mother ship. As a result, there are no actual casualties in the battles. A TERRA engineer named Curtis Lawson builds a time machine to travel back 1000 years because people's reflexes have significantly declined by the year 30. He enlists four girls there to fight for TERRA.