OVA
Description
Fumika Narutaki attends Mahora Academy as a student in Class 2/3-A and lives in the girls' dormitory. She is the younger twin sister of Fuka Narutaki. Both sisters share identical physical traits: standing 128 cm tall, weighing 54.3 kg, with measurements of B62-W46-H55, pink hair, and a birthday on December 6th. Fumika possesses distinctive blue eyes compared to Fuka's bright pink eyes, and has blood type A. While physically identical, Fumika exhibits a more cautious and reserved personality, contrasting with her sister's mischievous and energetic nature. She frequently tries to dissuade Fuka from pranks but typically ends up participating alongside her.

Academically, both twins achieve high grades, though consistently lower than their classmate Chizuru Naba. They belong to the Strolling Club, using their knowledge of the school grounds to guide others, including their teacher Negi Springfield. Reflecting her enjoyment of cleaning, Fumika also volunteers for the Beautification Committee. Her hobbies include consuming sweet foods, while she dislikes hairy and long objects like caterpillars. Alongside Fuka, she claims to receive ninjutsu training from their roommate Kaede Nagase, often donning ninja outfits during activities such as the "Kiss Negi" contest in Kyoto. Their actual ninja skills remain rudimentary, primarily limited to eavesdropping rather than combat.

During the Kyoto trip, the twins spied on Negi's group planning their journey to England and relayed this information to classmates. They attempted to join Negi's expedition by stealing Kaede's access badge but were swiftly defeated by Kaede during their ambush. Consequently, they traveled to England with Ayaka Yukihiro instead, staying at Nekane Springfield's residence and touring Negi's hometown.

The twins share a unique Pactio contract with Negi called "Geminae Simulatrices" (Simulating Twins), resulting from a botched ritual where both simultaneously kissed a copy of Negi, creating a single shared Pactio card. Across adaptations, the Pactio manifests differently: In the original Negima! anime, it grants them matching ninja outfits and the ability to perform shadow doppelganger techniques together. In Negima!?, Fumika's Pactio takes a "Cosplay" form as a Western-style detective featuring a magnifying glass artifact capable of glimpsing an object's future. During the "Suka incident" in this adaptation, she temporarily transforms into a bumblebee. An "Armor" variant also exists, depicting her as a ninja with scroll-based equipment and color-inverted details compared to Fuka's outfit.

Fumika's character portrayal varies across media. Some adaptations, particularly the original Negima! anime, minimize her personality differences from Fuka, making them virtually identical in behavior. Other interpretations, like Negima!? and the manga, maintain her distinct cautious and reserved traits.

In the series' epilogue, Fumika participates in the mission to rescue Nagi Springfield and defeat the Mage of the Beginning. Earlier, around Christmas, she and Fuka encountered two animals that revealed themselves as magic princes in disguise; these princes maintained contact with the twins following the conflict. After graduating high school, Fumika married and had a daughter. She and Fuka became known as the "biggest Cinderella stories" of their class, eventually residing near Ariadne within the scenic old capital bordering the Hellas Empire.