Leave the room, then turn right.
Consult this map for this part:
Just kill all the demons to finish the scenario.
Route: Kotaro | Oyu | S-Rank
You'll find Oyu or Kotaro is having trouble dealing with demons. Save them and clean up the area until he/she left the scene.
Hidden Red Souls #33: Just above the door.
Then follow the path up to the mountain and don't forget to absorb souls from the soul lamp in the next area.
Hidden Chest #9: Medicine - Near the mountain gate after the stairs.
In front of the mountain gate, destroy the stone lantern to reveal an object:
- Item: Medicine
Enter the gate.
Defeat the demon and talk to Oyu to complete the scenario. As a result, your health and magic bars increase.
Pass through the waterfall, enter the storage house. There is a Magic Mirror and a blue book at the bottom passes the screen.
- File: Hunting Schedule
Next, go downstairs to the dock.
Hidden Red Souls #34: At the boat dock, walk around until the camera changes the angle showing the lake house on the other side.
Hop onto the boat to the lake house. Kill all demons blocking the way, then enter the house. Clean up the room and pick up 3 files:
- File: Artwork #13 - on the floor
- File: Book of Fortinbras - yellow book on the table
- File: The Golden Evil Statue - Purple book on the chair
Enter the next room.
Hidden Red Souls #35: Just above the two petrified miners.
Now use the "Great Powder Tube" on the two miners. If you talk to the miner on the left again, he'll give you a medicine:
- Item: Secret Medicine
Open the door, then examine the tablet for another puzzle. Just like the previous one, simply move the pieces from one side to another.
Once completed the puzzle, step on the portal to teleport back to Onigashima.