Muvluv Unlimited

Boarding school student Takeshi wakes in a parallel world where Earth is under attack by mysterious alien invaders. To find a way back home, he must join forces with a group of female warriors, many of whom look just like his classmates and friends. A sequel to the original Muv-Luv game, the story follows Takeshi as he faces this threatened world and the people who resemble those he left behind.