Fūka Narutaki, a spirited student at Mahora Academy, is the older twin of Fumika Narutaki. With pink ponytails, bright pink eyes, and a height of 128 cm, she stands out as one of her class’s shortest students, mirroring her sister’s pre-adolescent build. Fūka thrives on mischief, channeling her boundless energy into pranks and playful schemes with little regard for fallout—a stark contrast to Fumika’s cautiousness, though the pair remain fiercely inseparable. The twins revere their roommate Kaede Nagase, adopting ninja-inspired attire and boasting of ninjutsu training under her mentorship. Their skills, however, are purely performative, relying on flashy illusions like shadow doppelgangers during Pactio activations. Their shared Pactio, *Geminae Simulatrices*, emerged from a mishap in Kyoto when both kissed a copy of Negi Springfield during a ritual, forging a flawed card that grants limited powers—creating clones or shifting into forms like a detective or bumblebee in certain adaptations. As Strolling Club members, Fūka aids Negi in navigating Mahora’s campus, leveraging her sharp familiarity with its layout. Her loyalty to the club and sister clashes with her headstrong impulsiveness, such as a failed attempt to steal Kaede’s badge to join Negi’s mission abroad. She needles classmates with teasing jabs, often poking at insecurities like Makie Sasaki’s flat chest despite her own youthful physique. During the series’ climax, Fūka fights alongside allies against the Mage of the Beginning, contributing to rescuing Negi’s father. Post-graduation, she settles near Ariadne in the Hellas Empire’s borderlands, marrying an unnamed partner and raising a daughter. A whimsical subplot hints at her encountering magical princes disguised as animals during a Christmas event, though this tale remains untold in official works. Initially conceptualized under the placeholder name Sayu Narushima, her name means “windy fragrance.” Academically, she and Fumika rank just below Chizuru Naba, excelling near the top of their class. Their dual-bound Pactio card remains a singular anomaly in the series, unmatched in its twin-binding magic.