Prologue: The Tank Shop

On board the Oarai carrier, Yukari Akiyama is living her best life. She is a prominent member of Oarai Academy's Sensha-do team and has made friends for life. But things change one day when Yukari meets someone and starts to develop feelings she's never felt before.

However, while Yukari is coming to terms with her feelings, something else is slowly brewing. Soon, Oarai Academy finds itself in a situation that puts it and the Oarai Carrier at risk of closure.

What starts as a simple story grows into a chaotic situation where secrets of Sensha-do are revealed while former rivals and unlikely allies agree to unite to save Oarai and the place its students have come to call home.