Fiene serves as the main heroine in the otome game "A Magical Romance" ("Majikoi" or "Love Me Magically"), where players typically guide her romantic journey. A commoner possessing innate magical talent, she earns a place at the elite Royal Academy of Magic. Surrounded by aristocratic peers, her non-noble origins initially create significant academic and social hurdles.

External commentary from Endo and Kobayashi dramatically shifts her narrative path. Originally positioned as a romantic interest for figures like Prince Siegwald, Fiene's role evolves towards building friendships, particularly with the game's designated villainess, Lieselotte Riefenstahl. This change occurs as Siegwald, influenced by the commentators, focuses on understanding his fiancée Lieselotte instead of pursuing Fiene.

Revelations about Fiene's lineage significantly expand her background. She is identified as the daughter of August Riefenstahl (Lieselotte's deceased uncle) and a noblewoman from the influential Marschner Duchy. This heritage recontextualizes her magical aptitude and social standing, though she remains unaware of this connection until later events.

Her relationship with Lieselotte becomes central to her development. Initially facing Lieselotte's jealousy and hostility—exemplified by a tense confrontation over a golden ribbon Fiene unknowingly displays—Fiene gradually overcomes her fear. Their dynamic transforms into mutual respect and eventual familial bonding, culminating in Lieselotte formally adopting Fiene as her sister to shield her from political threats posed by her maternal grandparents.

Fiene also forms a close bond with Lieselotte's cousin, Baldur Riefenstahl, who becomes her primary romantic partner. Their relationship strengthens as they collaborate to support Siegwald and Lieselotte's union and combat external threats like the Witch of Yore.

Notably, Fiene exhibits unconventional combat proficiency. Despite her healing magic, she employs a distinctive fighting style involving powerful, self-inflicted punches followed by immediate self-healing, highlighting her adaptability and determination.

Her journey concludes with full integration into the Riefenstahl family, securing her social position and legacy. She actively participates in ensuring Lieselotte's survival and happiness, solidifying her transition from an isolated commoner to a cherished noble and key figure in averting the game's original tragic outcomes.