OVA
Description
Biwa Hayahide is a student at Tracen Academy and a member of the senior division, residing in the Ritto dormitory where her roommate is T.M. Opera O. She is characterized as a fiery intellectual who wields logic as her primary weapon, approaching every problem as a theorist who breaks down challenges systematically. Despite her strong theoretical foundation, she places great value on practical application, ensuring that her methods never remain mere talk. This analytical nature has been honed through her efforts to compete with the overwhelming natural talent of her younger sister, Narita Brian.

Her physical appearance includes long, voluminous white hair adorned with golden ear ornaments—a simple clip on the left ear and an intricate ring on the right. She has yellow eyes and wears a pair of red under-rim glasses, which reference the red hood or blinkers worn by her real-life racing counterpart. Her race outfit consists of a fitted dark magenta jacket with gold buttons over a black blouse with a red ribbon, paired with a matching pleated skirt and thigh-high stockings that feature pink spike patterns, along with gray heeled loafers. Standing 171 centimeters tall, her measurements are listed as B93, W61, H88.

Biwa Hayahide has several notable personality quirks and insecurities. She is notably self-conscious about the size of her head, insisting that it is not big, and reacts defensively even when comments about a large head are not directed at her. This insecurity stems from her real-life counterpart, a racehorse known for having a slightly larger head than most, with commentators joking that the head alone could win a photo finish. She is also sensitive about her voluminous hair, comparing it to an untamable raging dragon and lamenting that she does not have smooth, silky hair like her sister Brian. Additional traits include sensitivity to loud noises since childhood, difficulty managing her tail in humid weather during the rainy season which she dislikes, and a personal rule of always placing her glasses in a safe spot to her left before sleeping. She has a particular fondness for bananas and can consume one in under five seconds.

In terms of her role in the story, particularly within the BNW no Chikai specials, Biwa Hayahide is part of the trio known as BNW alongside Narita Taishin and Winning Ticket, who are her close friends and rivals. The three share a deep bond forged through competition in Japan's classic races. When tensions fracture the BNW trio after a collective racing failure, Biwa Hayahide joins a city-wide relay event in an effort to reconcile with her teammates. During this event, she falls ill after searching for her friends in the rain, prompting her sister Narita Brian to substitute for her in the relay. The trio eventually reunites, and Biwa Hayahide achieves a symbolic victory at the Osaka Hai, reaffirming their rivalry and bond.

Her key relationships are central to her character. With Narita Brian, her younger sister, Biwa Hayahide constantly worries about Brian's health and well-being, including her eating habits and physique, often to Brian's annoyance, though the two genuinely care for each other. The real-life racehorses were half-brothers from the same mother who were planned to race against each other in the 1994 Arima Kinen before Biwa Hayahide's retirement due to tendonitis left the showdown unrealized. With Narita Taishin and Winning Ticket, she shares a friendship and rivalry that defines the BNW trio, often helping Ticket with studying and training. With her roommate T.M. Opera O, she frequently becomes annoyed by Opera O's antics, such as spreading rose petals across their dormitory floor.

Regarding her development, Biwa Hayahide's methodical and disciplined approach to racing stems from her desire to measure up to her sister's prodigious talent. She is constantly seeking to build what she calls the formula for victory, using calculation and logic to determine the best way to win. Despite her cool and intellectual exterior, she struggles with feelings of inferiority regarding the attention her sister receives, which motivates her rigorous self-discipline and pursuit of excellence through both study and training. Before a race, she thoroughly researches everything about the other runners, even down to their favorite foods.

Her notable abilities extend beyond racing. She excels academically with no weak subjects, particularly favoring mathematics, science, and Japanese in that precise order. In racing, she demonstrates skill in medium to long-distance events, employing tactics that allow her to overtake rivals in the final stretches. Her methodical endurance and late-race surge tactics are reflected in her racing approach, where her intelligence and preparation are as important as her physical capabilities. Off the track, she maintains a secret hobby of writing reviews for hair spray products, reflecting her ongoing struggle with her voluminous hair.