The story is set in the Warring States period. Bokuden Tsukahara, a renowned master swordsman even at the age of 73, continues his journey of sword training with his young apprentice Sakura.

Guided by the god of martial arts, Takemikazuchi-no-Kami, Bokuden seeks a way of the sword to save lives. Along the way, he encounters a village girl named Okoma, who is screaming and running away. She is pursued by the sinister shadow of bandits who make a fortune preying on travelers on the road...

Can a sword save a life — and a heart?
Now, a single ray of light shines on a journey of endless questions and battles!!