Gate: Jieitai Kanochi nite, Kaku Tatakaeri is a Japanese fantasy novel series written by Takumi Yanai. It follows the story of a modern-day military force that is transported to a fantasy world inhabited by magical creatures and warriors. The series explores themes of cultural exchange, military strategy, and diplomacy. It was adapted into an anime television series in 2015, gaining popularity for its unique blend of military science fiction and fantasy elements.