HdE said:
I had no idea there was a Eureka 7 movie, and I know nothing of Musashi. Oh, wait - it's Mamoru Oshii? Easy skip for me, then.
Oshii is not the director ofr this, I believe he was remotely involved in the story, but I'm unsure.
Musashi is known in Japan as the greatest Samurai who ever lived and there are several personifications of him. He fought dozens and dozens of duels to the death and at least three high profile samurais as well. From wiki:
"Musashi challenged Yoshioka Seijūrō, master of the Yoshioka School, to a duel. Seijūrō accepted, and they agreed to a duel outside Rendaiji in Rakuhoku, in the northern part of Kyoto on 8 March 1604. Musashi arrived late, greatly irritating Seijūrō. They faced off, and Musashi struck a single blow, per their agreement. This blow struck Seijūrō on the left shoulder, knocking him out, and crippling his left arm. He apparently passed on the headship of the school to his equally accomplished brother, Yoshioka Denshichirō, who promptly challenged Musashi for revenge. The duel variously took place in Kyoto outside a temple, Sanjūsangen-dō. Denshichirō wielded a staff reinforced with steel rings (or possibly with a ball-and-chain attached), while Musashi arrived late a second time. Musashi disarmed Denshichirō and defeated him. This second victory outraged the Yoshioka clan, whose head was now the 12-year old Yoshioka Matashichiro. They assembled a force of archers, musketeers and swordsmen, and challenged Musashi to a duel outside Kyoto, near Ichijoji Temple. Musashi broke his previous habit of arriving late, and came to the temple hours early. Hidden, Musashi assaulted the force, killing Matashichiro, and escaping while being attacked by dozens of his victim's supporters. With the death of Matashichiro, this branch of the Yoshioka School was destroyed."
Yep, I'm sort of a Musashi fanboy =)