Fuuka Reventon grew up in an orphanage beside Rinne Berlinetta, until a wealthy family adopted Rinne and the friendship went cold. On her own now, Fuuka scrapes by on odd jobs and street fights until a beating puts her in hospital, where the martial-arts champion Einhart Stratos offers her a place at the Nakajima Gym. A spin-off of the Nanoha ViVid arc, it puts Fuuka into real training while Rinne grows into a fighter others fear, and points the two former friends toward the ring.