| In the 311th year of the Orbital Era, humanity has migrated to countless colony clusters in space. Akiha is the third of five daughters of the Shishido Foundation, a group famous for space development. However, she is an ordinary girl - raised and schooled in a colony. One day, she encounters a malevolent artificial intelligence named Leopard, that has been installed on a colony. Leopard is a self-centred entity that is virtually the sum of all negative aspects of humans, treating Akiha like a servant, which she resents. However, Leopard claims it has something it must do. With the aid of a female Inter-Colony Police officer named Itsuki Kannagi, a quiet girl named Honoka Kawai and a robot called Imoko "Imo-chan" Shishidou, Akiha investigates what Leopard intends to do.
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