During Japan's feudal era, Mitsuhide Akechi worked to foil Nobunaga Oda's ambition for the unification of the entire country. To this end, Akechi had his eyes set on many of Oda's vassals, including leyasu Tokugawa. To protect Tokugawa's life, the kunoichi Kaede is sent to keep an eye on him as he travels through the mountains of Igo. Hiding in plain sight as a boxwood inn, she discovers that a skilled killer and his crew are already gathering in the area. Will a single lady ninja be able to complete her mission in the face of so many armed and dangerous men?

Sayaka Komaki is a girl living an ordinary school life. She secretly has a crush on Shindo, a student in the same grade. But her peaceful life changes when one of the school’s basketball club members suddenly disappears. And she meets a new girl in school, mysterious Setsuna, who moved in around the time the student went missing. Something inside Sayaka begins to change after meeting this new girl in school. Who is this Setsuna? Lovesick Sayaka and obsessed Shindo complicate the story, trying to get what they want. Egotistical people can be manipulative. The truth can only be seen through purity, Setsuna’s blade.