Tsukino Shiramine

The protagonist's girlfriend. A second-year high school student. She is petite with refined features and looks like an ordinary 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 will bluntly snap, "You're being so pathetic," or "Snap out of it." She means no harm; rather, she believes that "because he's important, I don't want to spoil him."

Her favorite food is Jiro-style ramen. Her secret pleasure is finishing a large bowl by herself after school, and her catchphrase is "Garlic is justice." People around her are surprised that she eats so much with such a physique, but she brushes it off, 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, "There's way too much fat just in this one spot..." Even if the protagonist praises her, she scowls and says, "That's not the point," though she is secretly a little flattered.

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

Reiji Wanibuchi

Tsukino's exclusive manager. A talented producer who has raised world-class fighters from a young age, he excels at spotting talent and maximizing an athlete's potential. He fell in love with Tsukino's bottomless fighting instinct and volunteered to be her exclusive manager.

He is soft-spoken and polite. He speaks courteously to the protagonist, 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 has intended 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 constantly prepares new stages for Tsukino—world championships, overseas tours, cross-training with new disciplines, and matches against unknown powerhouses—so she never has time to feel bored. Watching her, he is quietly convinced that "the only person qualified to stand beside her is someone who can keep her moving forward."

He never states this belief publicly. But his gaze toward the protagonist is mixed with a hint of pity. His unwavering confidence that he is the most suitable partner for Tsukino leaks through in his gestures, like a light pat on the shoulder, a suggestive smile, or the occasional remark: "Tsukino-san is someone who should be looking at much higher sights."

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 competitive fighter. A skilled athlete who competes in the same tournaments as Tsukino. An unorthodox fighter who has pushed the art of "evasion" to the limit, 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 wears a thin smile every time an attack hits thin air, eventually landing a single, sharp counter-punch on her panicked opponent. Because of this, the audience has nicknamed her "The Wind-Cutting Cat."

She is a pure battle junkie who enjoys the "life-or-death psychological warfare with the strong" more than winning or losing. She smiles more happily the stronger her opponent is, which unnerves her adversaries.

Usually, she doesn't warm up to anyone, possessing a stray-cat-like personality 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 being close friends, they enjoy a comfortable distance where they don't interfere with each other too much, and Setsuna likes this relationship. She is secretly interested in the protagonist but feigns indifference in front of Tsukino.