Immortals: Muv-Luv Alternative is a mobile game from the "Muv-luv" series, released on both iOS and Android exclusively in Japan. The setting of the game inherits the worldview and the story background of the original work "Muv-luv", which is a visual novel of love comedy in the first chapter, then becomes a serious sci-fi adventure story. Players need to control the popular characters from the series and Tactical Surface Fighters (TSF), a kind of large bipedal machine, to fight against a mysterious swarm of alien creatures called "Beta", as they have invaded and disrupted the Earth. All the stories narrated in the game are completely new and original. Players can enjoy a riveting plot with an intense atmosphere and charismatic characters.