The anime is based on the top winning entry in northern Japan's Sendai-Miyagi Animation Contest from the visual novel creator group Ra-sen in 2008. Various companies then collaborated on a teaser trailer that ran during the Tokyo International Anime Fair this past March. The anime re-imagines Japan's violent Sengoku Jidai (Era of the Warring States) — instead of armored Japanese samurai, the story features powered-suited heroes from Japan and various countries around the world. (Source: ANN)