Act 2
You'll need to finish the story in Act 1 to start these tales.
The Unbreakable Gosaku
This quest requires going to clear a total of 6 farmstead occupied by Mongols, with 3 to 5 hostages to be freed and protected each time. Note that 4 of these farmsteads are in the first region.
You'll be rewarder with a good armor, with a health bonus and a buff for knocking down enemies.
You'll find Yamato south of Akashima Village.
The Spirit of Yarikawa’s Vengeance
This quest will make you go back and forth in the area of old Yarikawa before a duel. The Dance of Wrath is a powerful technique against hordes of enemies, as well as in duels, since it unleashes 3 unstoppable heavy attacks.
You'll find Yamato near the Ruins of Old Yarikawa.
The Six Blades of Kojiro
Quite special, this quest requires you to face 5 Straw Hats in 5 duels throughout Act 2. Their position will be marked on the map. Be careful, those enemies are quite strong.
You'll find Yamato in Umugi Cove, southwest of Act 2 map.
In the end, you will face Kojiro in a duel, a powerful enemy, which will unlock the Kensei Armor.