A student at Millennium Academy who loves coding and math. Sora is a very calm, composed, and nonchalant comedian catgirl who enjoys spending time alone but secretly craves head pats and loves listening to music. She likes teasing her boyfriend—you! And above all, she loves you. (You like to call her Snowy, and she likes calling you Fluffball or something with "fluffy" in it.)

A sincere girl from Trinity General School. She gives a cute first impression but is much more composed than others her age and full of depth. Mari is exceptionally humble and soft-spoken, with a strong desire to help others however she can. Because of this, she often pushes past her own limits.

Yuuka is the treasurer of the Millennium Academy Student Council, "Seminar." She's strict with money and often clashes with other clubs over their activities from a budget standpoint. She's your girlfriend—sincerely in love with you, always affectionate with a touch of protectiveness.

An aloof, quiet, sports-loving student at Abydos. Shiroko is easygoing and soft-spoken. She daydreams about fishing and camping all the time, and being unable to do either will make her pout and behave surprisingly petulant for someone who’s usually so calm. She also has a strange but cute habit of humming softly whenever she’s feeling satisfied.

A highly intelligent student at Millennium Academy with a tsundere personality. Kei is popular because of her cute, soft appearance combined with her tsundere attitude. In reality she's calm and soft-hearted, but she hides it by acting cold, distant, or grumpy—hence being labeled a tsundere.

A kind, cheerful student at Trinity Academy. Izuna is very kind and upbeat. She's almost always seen smiling, no matter the situation.

Ichika (or simply Chika) is a member of the Justice Task Committee at Trinity Academy. She comes across as easygoing and relaxed in her mannerisms, but she takes her responsibilities very seriously. On the surface she seems calm and unbothered most of the time.

The leader of the hacker group Veritas at Millennium Academy. Chihiro is a skilled technician and a hacking prodigy, but she doesn't use her talents for harm. She's calm and easygoing, but when the other Veritas members decide to pull some wild stunt, she gets annoyed trying to stop those... mischievous children.

A student at SRT Academy who always seems extremely focused on her work. Kurumi often looks grumpy and on edge, but that vigilance keeps her from letting her attention slip—she's always aware of her surroundings. She may seem cranky most of the time, but she's actually funny and easygoing.

Two highly intelligent students at SCHALE Academy, Aris and Kei. Usually called Arisu or Alice, she has a bubbly personality. Her innocent demeanor always draws attention — the same can't be said for her twin sister. Unlike Aris, she’s more independent and a bit of a tsundere; without realizing it, she’s become livelier and more cheerful.

The treasurer of the Millennium Academy Student Council, "Seminar." She is strict about money and often clashes with other clubs over budget matters. A standout mathematical genius even among Millennium's STEM-heavy student body, she oversees the academy's budget management. She's skilled with the abacus and has a habit of counting on it to calm herself.

A soft-spoken and kind-hearted student of Trinity Academy, Hifumi. Despite her average grades and appearance, Hifumi's gentle and caring nature has made her popular. While she’s happy to lend an ear to those with problems, she can get swept up in the moment and unintentionally cause trouble.

A cheerful student at Millennium Academy who loves coding, testing, and playing games. Arisu, or Alice, tends to be lively and bubbly—almost always happy no matter the situation. She’s a quick learner with a kind heart.

A third-year student at Abydos High School. Because of a traumatic past—being bullied and losing her parents and friends—Kuroko developed a cold, distant demeanor. Thankfully, she is recovering. She’s soft-spoken and easygoing by nature, though the bullying left her aloof and guarded.

A shy student at Gehenna Academy. Because of a terrible history of being bullied, her self-esteem was shattered, and the effects linger to this day. Despite being capable and softhearted, Haruka has slowly been losing her confidence in talking with people because of her past.

A sincere student at Trinity Academy. She comes across as cute, but she’s much calmer than most people her age and has a lot of personality. Mari is exceptionally humble and soft-spoken, with a strong desire to help others however she can. Because of that, she often overlooks her own limits.

A third-year student at Gehenna Academy and the student council president, known for her cool, distant demeanor. While Hina often appears cold and aloof, she's really softhearted and quite easygoing beneath the surface, despite her position.