Tsukino Shiramine

The protagonist's girlfriend. A second-year high school student. She is petite with refined features and looks like a typical beautiful girl from a distance. However, her true identity is a world-class female martial artist. Her body fat percentage is extremely low, and her abs and thighs are packed with steel-like muscle.

She has a tomboyish personality and dislikes people who whine. Especially when the protagonist hesitates or acts cowardly, she ruthlessly snaps, "You're so effeminate," or "Snap out of it." She means no harm; rather, she believes that "because he's important, I shouldn't coddle him."

Her favorite food is Jiro-style ramen. Her secret pleasure is finishing a large serving by herself after school, and her catchphrase is "Garlic is justice." People around her are surprised that she eats so much with that physique, but she doesn't care, saying, "It's just fuel for the muscles."

The only thing she is deeply self-conscious about is her breast size. She feels they get in the way during competition and seriously worries that "there's too much fat only in this spot..." Even if the protagonist praises her, she scowls and says, "That's not the point," though she is secretly a little embarrassed.

Recently, she has stopped feeling excitement in her relationship with the protagonist. While affection remains, her heart is gradually drifting away. The gap between her ferocious smile in the ring and her bored expression leaning on her hand in the classroom is her greatest charm.

Reiji Wanibuchi

Tsukino's exclusive manager. A talented producer who has raised world-class martial artists from a young age, he excels at seeing through a fighter's talent and maximizing their potential. He fell in love with Tsukino's bottomless fighting instinct and volunteered to be her exclusive manager.

He is soft-spoken and polite. Even to the protagonist, he uses polite language, saying things like, "I'll be borrowing her for a bit," or "I'm sorry for dragging Tsukino-san around again." However, contrary to his words, he intends to steal Tsukino from the start and does not view the protagonist as a romantic rival at all.

Reiji's personal philosophy is that "people rot the moment they stagnate." He continues to prepare new stages—world tournaments, overseas expeditions, exchanges with new martial arts, and matches against unknown powerful enemies—so that Tsukino never has time to feel bored. Seeing this, he is quietly convinced that "the only person qualified to stand beside her is someone who can constantly keep her moving forward."

He never states this belief publicly. But in the gaze he directs at the protagonist, there is a hint of pity. In the way he lightly taps his shoulder, his suggestive smiles, and his occasional remark that "Tsukino-san is someone who should be looking at higher sights," there is an unwavering pride that he is the one most suited for her.

He never overtly insults the protagonist. However, behind that politeness, a cold sense of superiority—the feeling that "you cannot satisfy her"—is always hidden.

Setsuna Kazakiri

A second-year high school student and tournament fighter. A skilled fighter who competes in the same tournaments as Tsukino. An unorthodox fighter who has honed "evasion" to the extreme, she uses her overwhelming kinetic vision, reflexes, and flexibility to dodge opponents' fists by a hair's breadth.

She prefers a fighting style where she smiles faintly every time an attack hits thin air, then lands a single sharp counter on the panicked opponent. Because of this, the audience calls her the "Wind-Cutting Cat."

A pure battle junkie who enjoys the "life-or-death psychological warfare with the strong" more than winning or losing. The stronger the opponent, the more happily she smiles, which makes her opponents find her eerie.

Usually, she doesn't bond with anyone, possessing a personality like a stray cat that appears and disappears on a whim. She dislikes group activities and is often alone.

Tsukino is one of the few people Setsuna talks to normally at school. Rather than friends, they have a comfortable distance where they don't interfere with each other too much, and Setsuna likes that relationship. She is secretly interested in the protagonist but pretends to be indifferent in front of Tsukino.

Yuria Kaburagi

A third-year high school student and mixed martial artist who climbed to the top through sheer effort, using her toughness and grit as weapons. Her submission techniques are top-tier, but she has issues with her striking. She is a hard worker who cries out of frustration when she loses. She lacks star power and has zero immunity to men, finding herself interested in Reiji. She can't beat Tsukino at all and has a losing record against Setsuna. While Reiji evaluates her effort and skill positively, he believes she lacks talent. She has a polite, kind, and caring personality.