OVA
Description
Fuuka Reventon grew up alongside Rinne Berlinetta in an orphanage run by the Church of St. Kaiser on Midchilda. Her childhood was marked by frequent physical fights, often against older or stronger opponents, driven solely by her fierce desire to protect Rinne. These protective incidents repeatedly caused trouble for the orphanage, ultimately leading to Fuuka's departure. Living as a freelancer afterward, she supported herself through various part-time jobs.

Approximately one year before the main events, Fuuka's friendship with Rinne fractured severely. The rift began when Rinne made harsh comments about her defeated opponent, Lyra Caprice, in a post-Striker Championship interview. Fuuka expressed pity for Lyra, sparking a confrontation between the former friends that ended with Rinne decisively defeating Fuuka. This defeat left Fuuka determined to understand the change in Rinne and find a way to reconnect.

Fuuka's life shifted after an encounter with Einhard Stratos. Injured following a street fight with gangsters, Fuuka was inadvertently rescued by Einhard. After recovering, Fuuka sought Einhard out at Nakajima Gym. Recognizing Fuuka's latent combat potential—her natural physical strength and instinctive ability to channel mana into her strikes—Einhard invited her to join the gym. Nove Nakajima offered Fuuka part-time employment and lodging, providing stability. Fuuka accepted, seeing this as her opportunity to train for a future rematch with Rinne.

Under Einhard's mentorship, Fuuka began formal training in Kaiser Arts, becoming Einhard's first apprentice outside the Shutra royal lineage. Starting unskilled in formal martial arts or magic, she developed rapidly. Sparring sessions with other gym members like Vivio Takamachi, Corona Timil, Rio Wesley, and Miura Rinaldi allowed her to incorporate elements of Strike Arts and Spring Sunlight Fist into her evolving style. Einhard taught her specialized techniques, most notably the Hegemon Sky-severing Knuckle spell. She later received an Intelligent Device named Huracan, resembling a small feline, to assist her magical capabilities.

Fuuka debuted as a Striker Championship athlete in the 0080 Winter Cup tournament. Her goal of facing Rinne in the tournament was thwarted when Rinne lost to Vivio. To resolve their conflict, Einhard arranged a private match between Fuuka and Rinne on Carnaaji. In this emotionally charged fight, Fuuka used the Hegemon Sky-severing Knuckle to defeat Rinne. The confrontation allowed both to express suppressed feelings, leading to reconciliation: Rinne confessed her self-hatred and emotional struggles, while Fuuka reaffirmed her commitment to their friendship. This victory advanced Fuuka to the tournament finals against Einhard, where she ultimately lost.

In combat, Fuuka employs a close-range style focused on physical enhancement. Her magic emits ocean blue light, utilizing a Modern Belka system with elements of Ancient Belka. Her primary spells are the Hegemon Sky-severing Knuckle for attack and Lightning Protection for defense. She can activate an "Adult Mode" transformation, altering her appearance to that of an 18-year-old to augment physical capabilities during matches; prior to obtaining Huracan, this required external magical support. Her Barrier Jacket, activated with "Armament!", features a blue color scheme and design elements inspired by Einhard's. Personality-wise, Fuuka transitioned from an aggressive delinquent into a more disciplined and respectful martial artist, while retaining her core determination and loyalty. She often uses affectionate nicknames for gym peers, like "Haru" for Einhard and "Vivi" for Vivio.