Momentary Lily

In the near future, robotic invaders called Wild Hunts have erased most of humanity. Five young women have banded together to survive and defeat the invaders using special weapons called Andvari. One day, they meet Renge, who has no memories of her past, but remembers enough to help them cook delicious food between battles. As they uncover the secrets of their powers and pasts, they try to make the most of their time together and find strength through their friendship.

Synopsis from Anime News Network