(From the publisher):
As the blazing battle between Benitora, Sasuke and Jiji Funjin heat up, Bentenmaru and Yuya basically jump out of the frying pan and into the fire... "Firefly" that is. Yuya and Bentenmaru run into Keikoku the Firefly -- an assassin of Mibu and the desperate fight that will determine the fate of two men begins as the Keikoku's mysterious identity is revealed.
Original title: サムライ ディーパー キョウ
Genre: Fiction→ Fantasy→ Historical