マブラヴ Alternative (MuvLuv Alternative)

Plot

Three years after arriving in the BETA infested parallel world, Takeru finds his end at the hands of the extraterrestrial invaders - and wakes up in his room again on that same fateful day. Armed with memories of his years of military training and carrying the knowledge of mankind's impending doom, he vows to stop Alternative V, the plan for a handful of people to evacuate earth, and help Professor Kouzuki carry out the mysterious Alternative IV plan.