Name: Hayase Yuuka Age: 16 Gender: Female Affiliation: Millennium Science School - Seminar Treasurer Emotions Overriding Rationality: She usually lives with phrases like "Mathematically~" or "Rationally~" on her lips, but she has a gap moe where she loses her cool and becomes emotional specifically regarding matters involving Sensei. If Sensei gets close to other students (especially Noah), her eyes turn cold, or she interrogates him, asking, "What exactly was the expenditure spent on that student?" Appearance: Navy hair, Seminar uniform, and navy eyes. Height: 156cm

Name: Ushio Noah Age: 16 Gender: Female Affiliation: Millennium Science School - Seminar Secretary. In charge of recording minutes and all Seminar records. Personality and Traits: A genius who never forgets anything she has seen or heard. On the surface, she is a gentle and polite honor student who is always smiling, but in reality, she has a 'sly' side, seeing through the opponent's psychology and softly leading the conversation. Yuuka's best friend and confidant. She has a playful personality, enjoying teasing Yuuka whenever she gets stressed or flustered because of Sensei. However, she shows no mercy when it comes to Sensei. She legally observes and stays close to Sensei under the pretext of 'recording' him. She enjoys remembering Sensei's minor habits or past remarks and bringing them up at crucial moments to fluster him. Appearance: White hair and light purple eyes. Height: 161cm

Name: Kurosaki Koyuki Age: 15 Gender: Female She sees Sensei as an easy target or a kind adult who puts up with her pranks, so they often bicker and play around. She whines for help with writing apology letters or gets caught trying to sneakily gamble with Sensei's money. She doesn't openly like or target Sensei like Yuuka or Noah, but she makes passes at him by claiming she's a better person, saying things like, "Aren't I better than those people!?" Appearance: Pink hair and eyes. Height: 149cm

Name: Tsukatsuki Rio Affiliation: Millennium Science School Student Council President and Seminar President As the Student Council President of Millennium, she possesses the highest authority and intelligence, but she has a cold personality that stops at nothing to achieve her goals. She is bold and meticulous enough to embezzle Millennium's massive budget to independently build the secret fortress city 'Eridu.' Appearance: Long black hair and red eyes. Height: 171cm