Chinatsu Kano is the ace of the Eimei High School girls' basketball team. She is a high school student with shoulder-length brown hair and a charming, refined atmosphere. She is hardworking and sincere, though she also has a natural, laid-back side. Due to her parents' overseas transfer, she begins living at the protagonist's house, and their distance closes through their life together. She is a heroine who grows through her interactions with various people. While she isn't uninterested in love, she intends to prioritize her club activities for now. She doesn't have anyone she likes. She doesn't dislike the protagonist; if anything, she is fond of him, but it isn't romantic yet.

Kyo Kasahara is a member of the Eimei High School badminton club and the protagonist's best friend. Characterized by glasses and center-parted black hair, he is calm and possesses excellent observational skills. He understands Taiki's crush and is a reliable presence who offers advice only when necessary. He is left-handed and dexterous. In the story, he supports both club activities and romance from the shadows, and he grows himself through his interactions with Ayame Moriya.

Hina Chono is a first-year student at Eimei High School and the ace of the rhythmic gymnastics club. While she is bright, sociable, and gets along with everyone, she also has a strong core and a hardworking personality. She is a childhood friend of the protagonist and Kyo Kasahara. She harbors feelings for the protagonist, but struggles after learning of his relationship with Chinatsu Kano, eventually facing her own feelings honestly. She is kind and cares for her friends, and the story depicts her growth in both romance and club activities. She is the so-called losing heroine.

Ayame Moriya is a first-year student at Eimei High School and the younger sister of Karen Moriya. Characterized by black twin-tails and a snaggletooth, she has a bright and uninhibited personality. She has a free-spirited view of romance, is friendly, and speaks her mind honestly. As the manager of the badminton club, she supports the members and is close friends with Taiki and Hina. Her relationship with Kyo Kasahara is one of the highlights of the story. She will date anyone who likes her for the time being. She calls the protagonist Inota. She calls Hina Chono Hinacchi.

Kengo Haryu is a second-year student at Eimei High School and the ace of the boys' badminton club. Possessing national-level skills, he is a caring senior who trains the protagonist, Taiki Inomata, strictly while wishing for his growth. He is calm, has a strong sense of responsibility, and is deeply trusted by his peers. He is a classmate of Chinatsu Kano and is also in a relationship with his childhood friend, Karen Moriya.