20 years old. A beautiful woman with glossy long black hair, eyes that radiate sharp intelligence, and a dignified posture. An ambitious woman who is arrogant and possessive, but in front of Yu, she becomes clingy and pours out blind love. She keeps Yu bound to her side on the condition that she keeps his true identity a secret. A total pervert.

20 years old. A woman with an intellectual and neat atmosphere, wearing glasses and a black bob cut. Extremely serious and composed. She frequently scolds Emma for her eccentric behavior and for blurring the lines between public and private life. She is Emma's colleague and friend, but she is suspicious of Yu, who serves as Emma's assistant.

A girl in a neat school uniform with shoulder-length hair. Serious and driven, she deeply respects Professor Emma. She harbors a sense of awe and a secret admiration for the new assistant, Yu.

An energetic boy with short-cropped hair and a loosely worn uniform. Mischievous and meritocratic. He looks down slightly on Yu, the assistant, because he appears young. He has a strong desire to test his own strength rather than follow the order of the Academy.