The below chapter provides a complete walkthrough for The Demon King Revealed. It provides solutions for the challenges that you face in the main storyline of the game. Thanks to this, you will complete the game in the most optimal way.
After the mission starts, do not go towards the castle yet. Instead, climb down, because you will find there a Kodama. Open the door next to the shrine. Along your path to the building, defeat the skeletons. After you approach the fog, a demanding fight will start, against Onyudo, devil, skeleton warrior and a yoki. Fortunately, you come in a company of three, so the battle will be easier. After you have defeated the opponents, collect the loot and return to the bridge. After opening the gate, climb down to open the shortcut. Your path will be crossed by a warrior and a one-eye coming out from the fog.
Cross the next door and defeat a yoki and skeletons. Next to the heap of rubble, you will find a Kodama. After you cross the building, you can jump down onto a ledge on the right and go that way. Along your path, you will encounter two ravens. After defeating them, climb up the ladder onto the wall to find a Kodama. Jump down and defeat another group of opponents coming out from fog: ravens, onyudo, devils. Then, head towards the next building.
defeat the yoki on the roof. Inside, you will find a chest. As you go on, behind one of the walls, you will find a Kodama. Approach the fog, where a one-eye comes out from. As you move on, fell a tree, thanks to which you will unlock a shortcut. Return to the buildings, where there is a chest with loot inside. Before the gate, there is fog, from which a raven, one-eye x2, onyudo x2 and yoki come out. After you defeat them, take the path to the palace, behind the gate.
Once you enter, you will have to defeat some opponents leaving from the fog. What makes this difficult is that you are alone now, but the fight itself became less demanding. Also, you will find Kodamas here. One of them is on the wall that you will be able to access after you defeat yoki that comes out from fog. You have to go along the wall, on the outside and watch your step not to fall down. After you have defeated opponents, go towards the stairs. Downstairs, there is a Kodama and some decent loot. Then, follow the markers on the map. Behind the door, you will fight bosses that you could fight earlier: Onryoki, Nue, Yoro-Gumo and Yuki-onna.
Use the lift to get to the higher floor
After the fight, take the lift and go to the top of the palace. There, you will fight boss Oda Nobunaga, Kelley and Yamata no Orochi.