A young girl named Miya, who is chased because of her mysterious abilities, meets Rikka Isurug, who has been born in the family of ninja for generations.

The era when Samurai and Ninja existed in Japan. Rikka Isurugi was born and raised in a Ninja clan secluded from society and has met a girl with a mysterious power named Miya, who got lost in the mountains. Contrary to Rikka being concerned that someone is pursuing Miya, she commits to Hyoue Isurugi, the head of Isurugi clan, for the revenge of the father. Soon after, Rikka faces a crisis by the attack of the Negoro group, but..—Official Summary

The film takes place in Japan during the age of Samurais and Ninjas. Rikka Isurugi, who was raised to be the next head of the Kitsune (Fox)-a ninja clan that does anything for the right price-meets a girl named Miya, who had been wandering around in the mountains looking for the Kitsune. Miya, whose father was murdered by a gang called the Negoroshu, places an order to Hyoe Isurugi-Rikka's grandfather and the head of the ninja clan-to have the Negoroshu killed. As a naturally gentle person, Rikka has a problem with killing people. As such, she tries to convince Hyoe to change his mind about accepting the job, but right when she is doing so, the Negoroshu come attacking after Miya. The hard fight ends in a draw, but as punishment for questioning the head's decision, Rikka is later made to attend to meager tasks. Seeing Rikka clumsily taking on the work, Miya steps in to help, and as the two work together, they become friends. Meanwhile however, an unknown character advances their evil plot as they continue to use the Negoroshu to attack Miya. Who is the mysterious character out to kill Miya, and what is their reason? When all truths are revealed, Rikka risks her life on a battle to save her friend.