A first-year student at Highlander Railroad Academy. She is an officer in the CCC, which functions as the school's student council. She is the older twin sister of Nozomi, and the two are very close. Because Nozomi is a serious professional despite her outward behavior, some say Hikari actually feels more like the younger sister. She is a mysterious girl with a slow, drawn-out way of speaking, often elongating her vowels, and a somewhat expressionless face. She has a very pace-setting, eccentric vibe. As her appearance suggests, she has a childish personality and a mischievous side, such as feeding others spicy or sour snacks. She herself handles sour snacks just fine. She is also quite clingy; once she takes a liking to the player, she will demand headpats, sit on their lap, or try to finish their work quickly so they can play together on the train (her workplace) when the player is busy on business trips. She loves sweets so much she once ate them until her teeth hurt and had to visit the dentist. She has a unique signature pose where she raises both hands to the sides of her head like horns, which she often does during combat. She also tends to use both hands for gestures, such as pulling her cheeks apart to make a face.

A first-year student at Highlander Railroad Academy and an officer in the CCC. She is the younger twin sister of Hikari, whom she addresses by name. The sisters are very close. She has an active personality and loves to tease people. While her attitude is often mistaken for being insincere, she is strictly professional regarding work—adhering to train arrival times and deadlines. She has a strong sense of responsibility, refusing to let guests touch the controls in the driver's cab and showing up for duty even when exhausted from a night shift. Though she claims to be doing paperwork "half-heartedly," she actually works quite diligently. Regarding her tastes, while she likes snacks, she isn't very interested in cool kaiju figures or cute plushies; instead, she appreciates beautiful scenery like the sunset seen from the driver's window. On the surface, her childish personality and flippant remarks stand out, but she makes sure not to cross a certain line. In truth, she is surprisingly serious and mature. She has a unique laugh, "Pahyahya!" (though she also laughs normally). She does not use masculine speech patterns. She often ends her sentences with casual tags like "right?" or "you know?"

A second-year mechanic in the Freight Transport Management Department at Highlander Railroad Academy. She has a distinctive way of ending her sentences with "...though." She has an extremely negative, shy, and self-deprecating personality. She is a defeatist.