In a distant future ravaged by a war against Space Monsters, humanity relies on elite pilots known as the 'Topless' to pilot the powerful Buster Machines in battle. Nono, a girl from a quiet Martian town, idolizes the legendary pilot 'Nono-Riri' and dreams of joining the fight. Encountering the solitary Topless pilot Lal'C Melk Mark, Nono sees a chance to pursue her aspirations despite the looming dangers, determined to forge her own path in a world filled with uncertainty and peril.