Infinite Universe Real-life figure Miyamoto Musashi was the most celebrated samurai of all time. The quintessential warrior-philosopher, Musashi authored A Book of Five Rings, a classic treatise in the canon of world philosophy and military strategy. But the path to enlightenment is an endless journey, and to get there through violent means—by way of the sword—makes mere survival an even greater challenge. Musashi endeavors to take on sword master Yagyū Sekishūsai, a man recognized by many to be the greatest swordsman of his time. But with Sekishūsai far past his prime, does Musashi truly believe that killing a seemingly helpless old man in his sleep will take him further along the path?