One day, Sylvie, a spy working for a certain kingdom, receives a mission: "There is a country that plans on attacking us. We need you to find out when they'll attack, how many soldiers they have, their strategy, everything." With her...

Samurai was the top of the world. When Samurai lost their power, Ninjas took their places to rule. It's an age of Ninjas. And this is a story about a Ninja girl in Ninja's country, Sougetsu....