Sengoku Otome: Momoiro Paradox

A girl named Hideyoshino stumbles into trouble after visiting a shrine to pray for success on an exam. She notices a glowing light and a figure casting a spell, but she accidentally knocks over a bell and falls into the shrine. The spell goes awry and transports her to the Sengoku Era. There, she meets Akechi Mitsuhide and Oda Nobunaga, though she discovers that all characters in this world are female. Hideyoshino joins Oda Nobunaga in a quest to locate the Crimson Armor, a legendary piece believed to grant the wearer the power to unify Japan.