マブラヴ　オルタネイティヴ

Muv-Luv Alternative continues Takeru Shirogane's story in a world where humanity is losing a long war against the alien BETA. Given a second chance to change the course of events, he joins a special squadron of pilots and becomes involved in a secret plan that could decide humanity's future. The story shifts from training-camp drama to large-scale military science fiction with heavy emotional stakes. It is widely considered one of the most acclaimed visual novels ever made.