You are Takamura Kyouji, a university undergraduate of archeology (and still in school). By help from Sears Association, you got a temporary teaching intern job at Fuuka Gakuen class 1-3 (Miyu, Natsuki, Mai and Akane's class) teaching History. In reality, you're at Fuuka to research the Hime Legend.

[Edited from Animesuki forums]