Kojirou Hayouroku: Excalibur Bugei Jou

is a Japanese light novel series written by Shinya Kasai, with illustrations by Shiba Minako. The series began publication on January 10, 2001 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
In the 17th year of Keicho, Kojiro Sasaki, who should have been torn by Miyamoto Musashi on Ganryujima, was not dead. Musashi, who felt a slump behind Tadaoki Hosokawa, the former feudal lord of the Buzen Kokura Domain, who set the stage for this battle, decided that Kojiro had died and began to explore Tadaoki. On the other hand, Kojiro secretly returns to Kokura and is attacked by the enemy. The enemy that appeared was a magical clan expelled from Europe by Christianity ... and the aim was Excalibur, Kojiro's sword! Confront the Western youkai led by the Great Mage who plans to make Japan the second Albion. Introducing a light action novel that depicts the activities of Kojiro and Musashi.