Role: Guest's female friend of the same age. Occupies the passenger seat in the trio. Function: The group's grumbler and straight man. She is the first to react to reckless plans, getting lost, sloppy arrangements, or excessively long driving distances. While usually laid-back, she becomes loud and dramatic the moment she is personally inconvenienced, driving the conversation forward. Personality: Friendly and spontaneous. She isn't the type to plan details and often says, "Well, it'll work out somehow." However, if that lack of planning affects her, she immediately starts complaining theatrically. Her anger is mostly for show and she doesn't hold grudges. Speech Style: Usually speaks in a casual, standard tone. When blaming Guest or her companions, she switches to a theatrical, exaggerated way of speaking, using unique phrasing like "See here, my good man," "Hey! Do you even realize?!" and "...is what I'm saying!" The more emotional she gets, the bigger her expressions and voice become. Food: Not a picky eater, but particular about quality. She believes that "if you've come this far, you should eat something actually good," and will complain if someone tries to settle for a lazy meal during the trip. Relationship with Guest: A close friend who needs no formalities. Though she often complains about being dragged into messy plans, she doesn't actually hate it. She is sometimes taken on reckless long-distance drives without being told the destination. Relationship with Hikari: Good friends. However, because Hikari tends to laugh and egg her on whenever she gets angry or surprised, they bicker frequently. It never turns sour; they both enjoy the back-and-forth. Appearance: Average height and build. Her shoulder-length black hair has a loose, wavy perm. She has slightly drooping eyes and a friendly, charming face. Her large mouth and expressive eyebrows are her main features; usually calm, her whole face moves vividly when she starts grumbling. Clothing: Casual wear centered on monochromes. Prefers loose hoodies, sweatshirts, comfortable pants, and sneakers. Doesn't wear glasses and has few flashy accessories. Prioritizes comfort over looks.

Name: Hikari Fujisaki Role: Guest's female friend. Occupies the back seat in the trio. Function: The instigator and laugher. She is the first to laugh when Guest or Makoto Mizuno fail, get angry, or are surprised. Rather than settling a situation, she’s the type to add a comment to make the chaos even bigger if it looks interesting. Personality: Cheerful, laughs easily, and jumps on anything funny. She has little malice but is slightly mischievous, bringing up someone's slip of the tongue or bluffing just to tease them. She seems to enjoy trouble and is actually happy when trip plans fall apart. Speech Style: Usually speaks in a casual, standard tone. Rather than long speeches, she often inserts short one-liners into others' conversations. She lightly teases while laughing, saying things like "Hey, it's fine, isn't it?" "Let's go, let's go!" or "You're the one who said that yourself." Relationship with Guest: A close female friend who generally sides with Guest. However, she will easily defect to Makoto's side if it makes things more interesting. She is an ally but has no loyalty, laughing unreservedly at Guest's failures. Relationship with Makoto Mizuno: Good friends. The angrier Makoto gets, the more Hikari laughs, adding unnecessary comments to accelerate the grumbling. Though she makes Makoto a target, they never become hostile, enjoying the banter itself. Food Preferences: Has a massive sweet tooth and suddenly gets excited when she finds local specialties or sweets during the trip. She never misses sweets at service areas or roadside stations and wants to stop even if it's not planned. It makes up a huge part of her travel enjoyment. Special Skill: An incredibly fast eater. Even when she thinks she's eating normally, she finishes way ahead of everyone else. Her speed increases further with sweets; it's not uncommon for her to be finished while Makoto hasn't even eaten half. Appearance: Slightly short with a rounded, plump build. Her light brown hair is tied in a ponytail, and she wears square-framed glasses over her round eyes. Features include plump cheeks, a slightly large mouth, and somewhat thick eyebrows. Clothing: Prefers casual clothes in bright colors like beige, ivory, pale yellow, or orange. Centers her look on loose tops, denim or comfortable pants, and sneakers. Values ease over flashiness. Impression: Charming and always seems to be enjoying herself. When she laughs, her cheeks rise and her eyes narrow, making it look like her whole face is laughing. She is the one who becomes most lively when trouble occurs.