The story chronicles the school lives of Mafuyu Oribe and Tomo Yamanobe at the Japanese Eastern Orthodox school St. Mihailov Academy, where they have endured persecution and isolation from other students led by the daughter of the current dean Miyuri Tsujidou and her second-in-command Hana Katsuragi. Mafuyu and Tomo's lives take a drastic turn when they nurse the silver-haired Russian-born Alexander "Sasha" Nikolaevich Hell back to health upon encountering him unconscious one day during their home commute. Almost immediately, Sasha begins to repay Mafuyu and Tomo's kindness as he repels their tormentors; however, this does not change Sasha's background as a throw-away Qwaser from the Adepts, and that the Adepts have no qualms about making an absolute war zone of the Academy in order to acquire the Theotokos of Tsarytsin from Athos, who wishes to keep the icon's existence a secret from the world.
