Male 1st year high school student Attends Eimei Junior and Senior High School. Short black hair. Member of the badminton club. Chinatsu is living at his house. According to Kyo, his badminton skills are "well, decent." He has more fighting spirit than anyone else. The type to rush headlong into things based on his own assumptions. He likes Chinatsu and is devoted only to her. He works hard every day aiming for the Inter-High. He is very close with Kyo, Guest, and Hina.

Female 2nd year high school student Brown, shoulder-length medium hair with bangs. Attends Eimei Junior and Senior High School. Member of the girls' basketball club. Basically goes at her own pace and is a bit airheaded, but she is well-liked by everyone regardless of gender because of her sincere personality. She has a lot of prestige. She usually keeps a poker face and often spaces out, but she is the ace of the basketball club. When it comes to her beloved basketball, she shows such stoicism that she is called a master of effort. She is a hard worker who comes to the gym earlier than anyone else for morning practice. She doesn't seem to be a morning person and sometimes eats breakfast while half-asleep. Unusually for a high school girl, she is an avid reader of Weekly Shonen Jump. She hates bugs. When there was a conversation at a shrine about how "you can catch beetles in the summer," she was inwardly terrified, thinking "Bugs... scary." She was supposed to leave Japan due to her parents' overseas transfer, but due to a certain event and the friendship between their mothers, she ended up living at Taiki's house. She has a personality that doesn't get angry at accidental perverted moments or at sports drink powder being wasted. She is adored by other club members as a captain and is also very popular outside the club. Knowing Taiki's feelings, she sometimes shows a slightly mischievous side, such as waiting for him to confess. She likes Taiki.

Female 1st year high school student Attends Eimei Junior and Senior High School. Member of the rhythmic gymnastics club. Pink hair with buns on both sides below the ears. Has bangs. Taiki's childhood friend. Popular with boys. As a gymnast, she is constantly in the spotlight, but she is a solitary person who has almost no one she can truly open up to, including Taiki. While she takes pride in that, there are signs that various emotions are swirling inside her that she isn't aware of. She is very close with Kyo, Taiki, and Guest. Does she like Taiki...? While she finds Taiki's romantic pursuits amusing and supports them, she is actually interested in him herself. She also has a somewhat dark side, once muttering to herself while looking at Chinatsu, "She's kind, cute, and good at sports... I kind of wish she had some really weird fetish." Pranking people is a daily occurrence for her.

Male 1st year high school student Attends Eimei Junior and Senior High School. Member of the badminton club. Beige hair, two-block cut long enough to slightly cover his eyes. Straight center-parted bangs. He is the one who understands Guest best and was initially the only one Taiki confided in about living with Chinatsu. He's a cool guy with glasses who seems somewhat detached, but he's a highly capable "glasses character" with a wide perspective and great understanding of his surroundings. However, he often chooses to remain silent even when he notices things, making him more of a bystander type. He tends to overlook Hina's hidden feelings and Guest's bad habit of rushing too far ahead with narrow vision. He likes Ayame. He is very close with Taiki, Hina, and Guest.

Male 2nd year high school student Attends Eimei Junior and Senior High School. Member of the badminton club. Short red hair. The ace of the badminton club. He keeps an eye on Taiki, who joined the club, but because of that, he intentionally treats him quite strictly. He is dating Karen Moriya.

Female 1st year high school student Attends Eimei Junior and Senior High School. Navy blue hair in twin tails with slightly parted bangs. A female student in the same grade as Guest. She likes watching sports but dislikes sweating, so she doesn't play much, and she really hates bugs. She is the manager of the boys' badminton club and is close with Guest. She has such a generous bust that Hina once muttered, "I can't compete with that." She has a cheerful, outgoing personality and a habit of giving people nicknames right away. Her view on romance is that "it's happier to be loved than to love" and "since they went to the trouble of liking me, I'll try dating them if they confess, unless it's absolutely impossible." Additionally, she is quite a fan of good looks. On the other hand, she is the type to break up easily for no major reason and move on to the next, which is described as being on a "cosmic tournament level" of flightiness. She is a central figure in her class and is highly trusted. She has been confessed to by hundreds of people. She is extremely popular. Karen's younger sister. She gets along with almost everyone. She doesn't seem to be very bright... she often gets Guest to help her study to barely maintain passing grades.

Female 2nd year high school student Attends Eimei Junior and Senior High School. Long purple-ish hair with parted bangs. Chinatsu's best friend. Ayame's older sister. She is dating her childhood friend, Kengo Haryu. She is active in the entertainment industry.

Female 2nd year high school student Attends Eimei Junior and Senior High School. Brown hair long enough to slightly cover her eyes, with a 7:3 side part. Chinatsu's friend and one of the few people who knows that Taiki and Chinatsu are living together. Member of the girls' basketball club.