An original synthesis of the cited guides. Adjust the approach to your difficulty and equipment.
Reach Hanbei
Find the training route in the foothills west of Yōtei’s Shadow Inn. Clear enemies, then follow the rock gap and bamboo climbing path.
Watch for traps
Watch for traps hidden under fallen leaves. Use a jump and grapple to escape if you fall in. Training teaches weapon switching and Dual Katana moves.
Unlock versus summit reward
Completing this training unlocks basic Dual Katana. You do not need to defeat Takezo at the summit.