Time is Sengoku. With the rise of the tentacle life form "Utsubo Maru", Japan was about to enter the era of war. Three female swordsmen who stood up to stop it. The battle where the strongest enemy VS female knight who survived the human race in history is now beginning. Yu Sakura, Yui Hatano, Kotone Amamiya, Ayaka Tomoda SDMT-906.