Shura No Toki is a series focusing on how legends tell of an invincible martial art known as Mutsu Enmei-Ryu, an unarmed style that allows the user to defeat any number of armed opponents using incredible speed and strength. This is the story of three generations of those who bear the Mutsu.
It also tells about their encounters and battles with the strongest fighters of their era. The great samurai, Musashi Miyamoto, cuts down a group of assassins and saves a young nobleman. However, he has no desire to work as an escort. To keep the young master safe, Musashi recommends a passerby from whom he senses great potential. And thus, Yakumo Mutsu becomes a bodyguard, and the young master gains the protection of an invincible warrior...