Sengoku Jieitai (戦国自衛隊; The Warring-States Self Defense Forces), the full official name being Gekipro Gekiharo Dai 11kai Kouen "Sengoku Jieitai" (劇団ゲキハロ第11回公演 ｢戦国自衛隊｣; Gekipro Gekiharo 11th Performance "The Warring-States Self Defense Forces"), is stage play featuring Berryz Koubou and ℃-ute. It was the eleventh collaborative theater work between Gekipro and Hello! Project as Gekiharo. The play ran between September 16 and October 2, 2011. The DVDs for both versions of the play were released on November 30, 2011.