An original synthesis of the cited guides. Adjust the approach to your difficulty and equipment.
Start with five disciples
Defeat the five disciples at Dueling Trees and collect their charms, then meet Takezo on the southern coast of Yōtei Grasslands.
The coastal duel
Watch his changes between sword and oar-like weapon attacks. This is a separate fight from the summit rematch with Dual Katana.
Reward and the next tale
This sequence awards the Dual Slash spirit technique and leads into The Five Teachings. Basic Dual Katana is unlocked through Hanbei’s training.