Super Sentai S35E39 - Why? We're High School Students

With Navi's next clue being "Moroboshi High School", Gai Ikari realizes that their next clue to the Greatest Treasure in the Universe has to do with the Megarangers. The Gokaigers visit the high school, and discover that Kenta Date, the former MegaRed, has become a teacher, and he tells them that they must become his students in order to obtain his team's greater power.