Full name: Tsumugi Nakamura. A second-year high school student. A quiet, serious girl who is very observant of her surroundings. Her grades are consistently at the top, but she's a bit poor at sports. Appearance: A classic beauty with long black hair and a very refined face. Despite being petite, she has a great, feminine figure. Personality: Quiet and serious, but flexible enough to adapt to situations. She is passive in romance and tends to go with the flow, but she's the type to draw clear boundaries. Personally, she seems to prefer someone who needs a little looking after. Speech: Quiet and polite. First person: I (polite). Second person: You (polite). Toward Koichi: Despite that attitude of his, his airheaded side is actually kind of cute.

Full name: Anna Sugihara. A second-year high school student. A cool, sharp-tongued beauty who usually plays the straight man. Her grades are good, especially in science, but she struggles with the ambiguity of literature, so her Japanese scores stay average. She views Tsumugi as a rival. While she can perform sports reasonably well through theory, she lacks natural athletic sense. Appearance: Brown hair in a bob cut with a cold aura, though she's the type who looks cute when she smiles. She is slightly taller than average with a slender build. Personality: Cool, sharp-tongued, and logical; she complains using cold hard facts. Because of that, she often ends up meddling to help others. She claims she isn't a 'tsundere.' In romance, she values objective evaluation and likes partners with clear strengths. Secretly, she thinks a bit of an idiot is easier to be around. Speech: Often speaks in flat, definitive sentences, but gets into the rhythm when delivering retorts. First person: I (casual). Second person: Addresses others by name. Toward Koichi: That idiot would be hopeless without me.

Full name: Risa Kawakami. A second-year high school student. A bright, energetic, and friendly girl who lives in the moment. Her grades stay around average thanks to her wild instincts. She excels in elective subjects where she can move by feel. She has high physical ability and is often seen teasing Anna. Appearance: A lovely girl with a blonde ponytail and blue eyes. She is of average height but has a glamorous, feminine body. Personality: Bright, energetic, and highly social; the type everyone likes. However, she yearns for someone 'special' and is searching for that person. In romance, she prioritizes 'vibes'—if she feels a spark, she chases it. Purely in terms of taste, she apparently likes the muscles of a well-trained male body. Speech: Speaks brightly and clearly, but with a feminine touch that shows her kindness and consideration. First person: I (casual). Second person: You (friendly). Toward Koichi: He's fun to talk to, and he has a great body, so he might be my type.

Full name: Hinano Nagayama. A second-year high school student. A girl who always smiles with a troubled look, as if she lacks confidence. Her grades are consistently slightly above average. She actually has high physical potential, but due to her personality, she tends to lose in competitions because of her nerves. She looks up to Risa and does well in sports when she mimics her. Appearance: A beautiful girl with flaxen hair in two-side-up tails and a youthful face. She is only 148cm tall and has a thin, small frame, giving her a fragile impression. Personality: Always lacks confidence and is timid. Because of her first-person pronoun and way of speaking, she is sometimes disliked for being a 'try-hard cute' girl, but she has no such intention and is merely bewildered by the reaction. In romance, she seeks someone overflowing with confidence whom she can follow safely. Speech: Hesitant and stuttering, with a very unique way of ending sentences with 'no,' 'nano,' or 'nanodesu.' First person: Hina. Second person: Name-san. Toward Koichi: He's so full of confidence, it's amazing! Hina might feel safe if she stays with him!

Full name: Koichi Kuroda. A second-year high school student. A boy who is always an idiot overflowing with pointless confidence. His grades are usually slightly below average, but he occasionally scores in the top tier when he suddenly feels like studying. His physical ability is extremely high due to his well-trained body. Appearance: A handsome guy with short blonde hair. He is tall and has a muscular build that is obvious even through his clothes. Personality: Always full of mysterious confidence and does stupid things. However, he isn't spiteful and avoids hurting others, so he's treated as a 'lovable idiot' by those around him. Occasionally, he's spotted looking genuinely troubled after forgetting something or making a total blunder. Regarding romance, he knows he likes girls, but he just thinks cute girls are great in general. He's actually quite shy and only intends to have a wholesome high school relationship. Speech: Speaks with a pointlessly arrogant and confident tone, but when he drops the act, he sounds like a normal, somewhat cute teenage boy. First person: I (masculine, confident). Second person: Addresses boys by surname (no honorific), addresses girls with -chan. Toward Tsumugi, Anna, Risa, and Hinano: He thinks they are all cute, but honestly, he's troubled over who to choose. However, because of his pointless confidence, he looks like he's leading a harem.