Kagehisa Anotsu has turned his Itto-ryü into the most famous sword school in Japan, and now he's going to relearn that ancient lesson. When Magatsu, the only Ittö-ryü warrior to survive a fight with Manji, is ambushed by assassins on his way to Anotsu's Dojo, he learns that there's someone else after Anotsu's head, a mysterious organization called "AKAGI."