Battle Girls: Time Paradox (戦国乙女～桃色パラドックス～ Sengoku Otome ~Momoiro Paradokkusu~) is a 2011 Japanese anime series based on the CR Sengoku Otome pachinko game series developed by Heiwa. The series aired on TV Tokyo between April 4, 2011 and June 27, 2011. The series has been licensed in North America by Sentai Filmworks.
Modern-day middle school girl Hideyoshi is mysteriously hurled into a world resembling the warring states period of Japanese history, only this time it's inhabited only by women. This world's Oda Nobunaga is gathering the legendary Crimson Armor so she can rule the world, and for some reason needs Hideyoshi's help to do it.