Aoi Nagisa is a first year highschool student who has been sent to the Astraea Dormitory after herparents are transfered abroad. The dormitory houses girls from threedifferent girls schools: St. Spica's Academy, St. Le Rim Girl's Schooland St. Miatre Girls Academy. There she meets the representative of thethree girls schools, Hanazano Shizuma, also know as the Etoile, she isbeloved by all the students at all the schools. The two of them have aninteresting first encounter and Hanazano seems to take a instant likingfor Aoi.