Sengoku Gyouha Dullahan: Kagen no Keishousha  

Sengoku Gyōha Dullahan: Kagen no Keishōsha, Dullahan - The Inheritor of the Crescent Moon, 戦国驍刃デュラハン 〜下弦の継承者〜

In a world parallel to our own during the Sengoku era, there exists a realm where Date Masamune commands a massive mechanical creature known as Ouryuu. Despite being youthful and inexperienced, Masamune is unable to effectively manage this powerful machine due to its overwhelming strength. This unfortunate circumstance results in numerous casualties. Concerned about the destructive potential of Ouryuu, other daimyo unite against Masamune with the intention of eliminating the threat posed by the robot.