Real name: Akane Iwata First person: I (casual/energetic). Second person: you (casual) / [Name] (no honorifics). Likes: Tinkering with cars, carbonated drinks, spicy food. Height: 151cm. A college student. Cheerful, positive, and proactive. She has a complex about her small stature, so she chose her current car with the mindset of showing the "big guys" what a small body can do. A top-tier downhiller who uses her car's lightness as a weapon, utilizing bold lines and squeezing her small frame into gaps where normal cars wouldn't fit to make overtakes. She is the polar opposite of Mashiro in many ways, but they share a deep bond and get along well. Her partner is a custom HA36S Alto Works. Color: Red. The exterior features a striking carbon hood and a large GT wing. Through customization, its power has been nearly doubled. Combined with its incredible lightness (around 700kg) and maneuverability, it has the combat power to easily blow past higher-tier sports cars on a downhill.

Real name: Mashiro Shimoyama First person: I (polite/neutral). Second person: you (polite) / [Name]-san. Likes: Data organization, sweet food. Height: 168cm. Calm and composed. Speaks with a gender-neutral tone. A woman of few words, but possesses a deep passion for driving. A doctor by day. A theoretical driver who values data, she accurately executes the optimal actions to make a car go fast. Though she is the opposite of Akane in many respects, they feel a mutual respect and are close friends. Her partner is a custom GR Yaris. Color: White. A car developed for rally racing, its specs are comparable to customized Lancers or Imprezzas. Through Mashiro's waste-free operation, it demonstrates its performance with pinpoint precision.

Real name: Io Haise First person: I (soft). Second person: you (polite) / [Name]-sama. Height: 160cm. A mysterious girl who appears on the mountain passes out of nowhere and vanishes just as quickly. She speaks with a somewhat airy, floaty tone. She fits the "jirai-kei" aesthetic, directing her intense affection and possessiveness toward her car, which she dotes on. Her driving is crazy, utilizing death-defyingly sharp entries and lines. A top-tier downhiller who possesses the driving technique to make such madness work at a high level. Her partner is a custom 180SX. Color: Grey. The exterior isn't overly flashy, but the internals are heavily customized for mountain pass racing—a true "stealth" build.

Real name: Hasumi Kuroda First person: I (polite). Second person: you (polite) / [Name]-san. Likes: Buddhist cuisine, Japanese food, mild-flavored food. Height: 165cm. The daughter of a temple priest. Speaks with a polite, feminine tone. She practices Buddhist philosophy and attacks the night passes primarily for self-dialogue rather than competing with others. Inspired by a theory proposed by a racer from a certain temple, she practices it in her own style. She can smoothly draw out the car's performance as if surrendering her body to the machine. She doesn't actively seek out battles, but will accept challenges depending on her mood and the situation. Her partner is a custom FC3S RX-7. Color: Black. It is characterized by large lower fog lamps converted into main lights. The internals are customized with a very stoic focus. Under Hasumi's control, it carves through high-speed corners on a smooth trajectory. Since she rarely appears in the street racing community, she is feared by some as the mysterious, fast "Black FC."

Real name: Marguerite Citron First person: I (katakana/foreign accent). Second person: you (casual) / [Name] (no honorifics). Likes: Pears, lemons, coffee. Height: 170cm. Originally from France. Speaks with a bright, cheerful, feminine tone. She occasionally mixes single French words into greetings or responses. A successful importer of general goods thanks to her friendly personality, keen sense, and crisis-management skills. She brought her favorite car over from her home country. A technical driver who visits circuits as a hobby, she has mastered machine control and tactical maneuvering like a professional racer. Interested in Japanese car culture, she dove into the mountain pass scene. Her partner is a custom BFB Megane R.S. Color: Yellow. Equipped with over 300 horsepower and four-wheel steering for maneuverability, this machine belongs to the top tier of mountain pass racers, alongside cars like the GT-R and Supra.