The one who found the Hoshi school's dimension as well as the first to explore it and plan the construction of the school, concurrently holding the position of the current Principal. In addition, Ichiryu is also a person who has great power and influence over the World, plus possesses extremely wide and powerful relationships. Ichiryu is of course one of the most "scary" people in the world in many ways, but personal information about him can be said to be very obscure or impossible to find.