Univeil Opera School”—a place where students learn singing, dancing, acting, and opera.
Here, only boys perform both male and female roles.
Male roles are called “Jacks,” and female roles are called “Jeannes.”
Among them, the students who play lead roles are called
the lead Jack, “Jack Ace,” and the lead Jeanne, “Jeanne Neune.

And…

Source : ORICON NEWS