Rakshasa Academy

Rakshasa Academy is a school exclusively for people who have Oni in their bloods. It was established in order for Oni to train on how to fight people from the Momotaro Clan. The said academy is located in a separated island called "Demon Gate Island" or "Onigashima".

Appearance
The academy appears to be like an old castle built using bricks. It has several buildings with each purposes and is covered with a big rock. There is also a bridge that serves as a passage where you can enter the building.