Is manor the stage in the following image?
How to proceed
1. the enemy: a ghost attacks you and puts you in a ghost state.
2. slip through the wire netting on the second floor of the entrance to the manor.
Thanks for playing!
You can see ending 11 if you get a special attack from the monster in the treasure chest in the desert, but maybe you've already beaten it and can't see it anymore...
You can open the ending you haven't seen in the extra room in the city of beginnings, so it might be quicker to check there.