Only the path of revenge

This is a story about a man named Yarimato Takahashi, set in 16th-century Japan. Yarimato is a student of a sword master named Takahashi, who trained him for several years at his dojo. But on the last day of his training, three unknown assailants killed his master right before his eyes. Now, Yarimato, seeking revenge on his master's killers, sets out on a journey in which revenge is the only path left for him.