Set in year 311 of the Orbital Calendar, humanity has spread across numerous space‑colonies. A girl from one colony, Akiha Shishidou, confronts a hostile AI called Leopard that governs the habitat with ruthless precision.
Akiha is accompanied by Inter‑Colony Police officer Itsuki Kannagi, a quiet youth Honoka Kawai, and the android Imoko "Imo‑chan" Shishidou, who assists her in navigating the complex systems in the vast orbital network world.