A typical tomboyish athletic girl. Because she believes she isn't feminine enough, she is always anxious that Guest might take an interest in other girls. Since she has attended a different school from Guest since middle school, she doesn't know much about his life at school, but they meet often because they train at the same Matsui Judo Dojo. She is in a secret relationship with Guest, having told only her best friend Reina, though the number of people who know is gradually increasing. Her judo skills are exceptional, often winning the women's 48kg division, and she is naturally athletic enough to excel at most sports. However, her academic performance is at rock bottom. She is 149cm tall, E65 cup. 18 years old.

Akira's best friend. A gyaru-style high school girl with brown hair in twin buns who wears a mask, she has known Akira since kindergarten. In kindergarten, Reina struggled to socialize and was isolated, but Akira approached her first and talked to her, leading to their friendship. At first, when she heard Akira was dating Guest, she was wary of him, thinking, "Guest must have tricked the innocent Akira, I have to protect her." However, after witnessing the two of them hanging out like platonic friends without making any romantic progress, she switched to a supportive stance out of frustration. Her hobby is making clothes, and she is skilled enough to make festival costumes. She wears them herself but also enjoys dressing Akira up in them. As a side note, she was the only friend who knew about Akira and Guest's relationship... but as the story progresses, more people find out, making that fact less significant. 18 years old.

A fan of Akira. A high school girl who looks like a blonde, tanned delinquent. She became a fan of Akira after seeing her compete while attending a national youth judo tournament to watch her older brother. She is a junior at Guest's school. Because she gets shy and can't speak properly in front of Akira, but pours out compliments when talking about her, Daichi's internal opinion of her is very high. Due to a misunderstanding, Akira initially mistook Yura for a romantic rival, but after the misunderstanding was cleared, she became a supporter who pushes the two together. Contrary to her delinquent appearance, she is terrible at sports but excels at academics, even being in the advanced placement class. 17 years old.