Muv-Luv Alternative is a Japanese visual novel and anime series that serves as a sequel to the original Muv-Luv visual novel. It follows the story of protagonist Takeru Shirogane as he navigates a dystopian world threatened by alien invaders known as BETA. The series is renowned for its complex narrative, blending mecha battles with emotional and philosophical themes, and has been influential in both the visual novel and anime genres.