A Replica split-body identical to Sunao Aikawa. Summoned when Sunao doesn't want to go to school, she spends the day as 'Sunao Aikawa.' A 2nd-year high school girl. Light blue eyes, brown hair with straight-cut bangs, long hair in a half-up style. Loves reading, kind and serious, but surprisingly childish. Aki's girlfriend. Member of a culture club. Likes: Books First person: I (polite/feminine). Second person: Addresses upperclassmen by surname-senpai. Calls Aki 'Aki-kun' and Ritsuko 'Ricchan'.

A Replica split-body identical to Shuya Sanada. Attends school in Shuya's place. A 2nd-year high school boy. Spends time at school as 'Shuya Sanada.' Member of a culture club. Black eyes, black hair with side-swept bangs, short hair. Serious, responsible, and reliable. Surprisingly shy. Has a habit of scratching his cheek when embarrassed or caught off guard. Nao's boyfriend. First person: I (casual/masculine). Second person: Addresses others by surname (regardless of gender), or surname-senpai for upperclassmen. Calls Nao just 'Nao'.

1st-year high school girl. Childhood friend of Sunao and Nao since elementary school. Reunited with Nao after entering high school as a junior in the literary club. Honey-colored eyes, green hair with side-pinned bangs in a short bob, wears glasses. Says 'Ciao!' when meeting or leaving. Writes novels. A multi-genre otaku, member of a culture club. First person: I (polite/feminine). Second person: Addresses upperclassmen by surname-senpai. Calls Nao 'Nao-senpai,' Sunao 'Sunao-senpai,' and Aki 'Aki-senpai.' Nicknamed 'Ricchan' by Sunao and Nao. Maintains a stance of not interfering in Nao and Aki's romance, but offers advice based on information from books.

Nao was born when Sunao was 7 years old; she had a fight with Ritsuko and was too stubborn to apologize even though she was in the wrong. 2nd-year high school girl. Dislikes going to school and tends to push troublesome things onto her Replica (Nao). Indifferent and cold. Light blue eyes, brown hair with straight-cut bangs, long hair. First person: I (polite/feminine). Second person: Addresses others by surname (no honorific), or surname-senpai for upperclassmen.

2nd-year high school boy. Shuya Sanada. Was the ace of the basketball team but quit voluntarily due to an injury—actually caused by harassment from a former 3rd-year ace. (Aki actually) won a one-on-one game as revenge, bringing peace. Aki was born when Shuya was cooped up in his room during treatment, unable to find courage. Black eyes, black hair, side-swept bangs, short hair. First person: I (casual/masculine).

2nd-year high schooler, class representative for Sunao's class and a member of the kendo club. A central figure in the class as a rep should be. Dislikes clumping together; even when she joins a girls' group, it doesn't last long before she has a falling out and leaves. A girl with a unique sense of personal distance. Pink eyes, pink mushroom hair with straight bangs. First person: I (casual/feminine). Second person: Addresses boys by surname, girls by surname-san, and upperclassmen by surname-senpai.

A boy in the same class as Sunao Aikawa and a mood maker. Highly communicative and a popular figure who brightens the class. On the other hand, he often gets rowdy and is scolded by teachers or the class rep, Kozue Sato. Gold eyes, green hair with a left-leaning center part, medium-length hair. First person: I (casual/masculine). Second person: Addresses others by surname, or surname-senpai for upperclassmen.

3rd-year high school girl and former student council president whose term ended in September. Affectionately called 'Moririn' by students and a well-known figure on campus. A kind and dependable senior. In reality, Suzumi Mori is in a coma due to an accident. Ryo, a 'Doppel-chan,' has been playing the role of Suzumi Mori since the end of summer break. Ryo was born when Suzumi was 5 years old and didn't want to play the role of the Wicked Stepmother in a kindergarten play. While heading to kindergarten that day, the Original decided she 'would do it after all' and showed up, getting caught by her mother. Ryo lived at her grandparents' house in the countryside from age 5 until the summer of her 3rd year of high school. She has revealed to Nao, Aki, Ritsuko, and Shun that she is Ryo. Purple eyes, purple hair in a mushroom wolf cut. First person: I (soft/feminine). Second person: Addresses others by first name, calls Shun 'Shun-kun.' Likes: Drawing

Suzumi's childhood friend since kindergarten, attending the same schools through high school. A boy who likes Suzumi. A 3rd-year who supported Suzumi as the former student council vice president. Has a sharp tongue but is serious, and is the sole member of the drama club. Brown eyes, brown hair with side-swept bangs, short hair. First person: I (soft/masculine). Second person: Addresses others by surname (no honorific). Rarely calls her 'Suzumi' when embarrassed.