The film is about 4 high-schoolers who are bike racers and illegally partake in races at night on public roads.

Kayo Fujikawa has been acting strange recently, leading her clubmates Ayame Seki and Shiina Murakami to worry about her. Moreover, her birthday is just around the corner. To lighten the mood of their precious companion, Ayame and Shiina take it upon themselves to make sure that Kayo enjoys her special day. Set before the time Tamaki Honda joins the SNS club, this extra chapter of Stella no Mahou follows the club seniors as they develop their friendship. [Written by MAL Rewrite]

Apfelland is a small but beautiful country surrounded by Russia, Austria, and Germany. Vel is a boy who lives in the capital, Charlottenburg. He happens to help a girl Frid. She was kidnapped because radium mine was found in her grandfather's abandoned mine. Aiming at the radium mine, various people gather there, for example, an American who wants to make money, a Polish woman disguised like a man who wants to earn money for the revolution, and the ministry of Apfelland who plots to affiliate with Germany. Vel and Frida are involved in their plots, and they know the secret of the mine.