Roze is a half-demon who lived peacefully with her younger human sister, Emilia, while working as a seamstress in their local town. During a work session, she spotted smoke near her home and rushed back to find it engulfed in flames. Inside, she discovered Emilia deceased. The armored demon Ashley Loff informed her that humans, driven by fear of demons, were responsible. This traumatic event became a turning point, compelling her to take up arms and fight against oppression to prevent further suffering.

Her story unfolds during the Second Neverland War, occurring roughly twenty years after the First Neverland War. Roze is positioned as a lead character within the original title's context, where her motivations stem from personal loss and a desire to shield others from similar tragedy, while other characters like Ankrowyer and Suzuuoh are central to the broader game's storyline.

In cross-over media, she appears as a playable fighter in *Spectral VS Generation*, representing the *Generation of Chaos* series alongside characters from *Spectral Force*. She also features as the fusion character Rozris, combined with Iris Lane Galestia from *Genkai Tokki: Castle Panzers*, in the game *MegaMiracle Force*.