Mugen School is a school, which is really the Heart Snatchers' base of operations. Doctor Tomoe was a professor there. Also, Telulu and Byruit (the latter going by the name "Julie Bardot") were students there. The Sailor Scouts would often sneak into the school to stop Doctor Tomoe and the Heart Snatchers. Byruit and Cyprin both stole Pure Hearts from the people taking exams there. It was destroyed when Pharaoh 90 was summoned and began to bring the Silence about, destroying Mugen School, and leaving a crater where it was once Pharaoh 90 was destroyed.