Act 1
The Legend of Tadayori
This Tale asks you to successively find two places covered in purple flowers. A duel awaits you then. The reward, Tadayori's Armour, is fantastic for an archery-based gameplay.
You can find Yamato in the Azamo Province.
The Heavenly Strike
Other than the big duel at the end, this quest is pretty easy. The Heavenly Strike is a fantastic fighting technique, especially during duels, since it's unstoppable. It deals massive damage to enemies with broken guards in exchange with some Resolve.
You'll find Yamato in the Komatsu Region, southeast of the Golden Temple.
The Curse of Uchitsune
This time, you'll have to spot a large flowered island near the sides, then a Shrine nestled in a small valley between the mountains. A difficult duel will follow, but the reward is definitly a must have. The longbow can instantly kill almost any Mongol soldier with a headshot, even those with a helmet.
The Explosive Arrows allow you to kill entire groups of enemies with just a shot or two.
You'll find Yamato north of Hiyoshi Springs.