Aboard Xanthippe, Akiha wakes up inside her box, with Imo-chan still trying to get her out and Leopard still searching for her. After Akiha's friends return from an unsuccessful search, they decide that Akiha must be in Kirkwood. However, Honoka collapses soon after, and reveals that her lifespan is nearly over. In the meantime, Kazane talks with Leopard, discussing how they can find Leopard's last three parts. When Benkei shows up to challenge Leopard again, Kazane successfully negotiates with Tsutsuji for the pair to retrieve the Proxima Crown for Leopard.
In the year 311 of the Orbital Calendar, humanity has migrated to countless colony clusters in space. A space colony girl named Akiha Shishidou encounters a malevolent artificial intelligence named Leopard that has been installed on a colony.
