The below chapter provides a complete walkthrough for The Champion of the East. It provides a solution to the challenges in the side quest of the game, which will allow you to complete it in the best possible way.
Guardian spirit: "Shinka"
The mission is to defeat Honda Tadakatsu. The fight, in itself, is about blocking Honda's attacks and attacking at the right moments. Note that when the opponent is low on health, it starts going up. In such a situation, you should use live weapon to end the battle as quickly as possible. After you have defeated Honda, you receive another guardian spirit - Shinka.