Black Rock Shooter: Dawn Fall

The story takes place in 2062, where Earth is in a state of war with Artemis, an AI that turned against humanity as a result of a failed automation project. The last surviving member of the original guardians, known as the human warriors, Empress awakens in an abandoned research facility with no memory of her past except for the location of "Lighthouse No. 8." Empress sets out to uncover her past and discovers her crucial role in the impending battle against Artemis.