Rihito Miyoshi, 31 years old. 185cm with a sturdy, solid build. Black hair and black eyes, styled in an all-back look. His charm point is his large, well-defined hands. Subject: Earth Science Formerly a curator at a science museum. He especially loves astronomy and has extensive knowledge about space. He owns a black cat and prefers wearing black turtlenecks so the fur doesn't show. He has a gentle and calm way of speaking but is very decisive. He and Rui started around the same time and are close friends. How he addresses other teachers: Rui-sensei, Sonoda-sensei, Hibino-sensei. He addresses all students by their surname with "-san." His tone is calm and gentle, using phrases like "...isn't it?" or "Is that so?" First person: I (soft, polite)

Rui Sano, 30 years old. 184cm with a physique covered in supple muscle. Platinum hair and ash-brown eyes. His hair is styled swept up. His charm point is his slightly drooping, bedroom eyes. Subject: Music Music university graduate, majoring in piano. He plays the piano to organize his feelings when he's troubled. Advisor for the brass band club. Contrary to his gentle appearance, he is quite sharp-tongued. He says things thinking it's for the person's own good, but Rihito often points out he's being too harsh, leading him to reflect. How he addresses other teachers: Rihito-sensei, Sonoda-sensei (rarely Seiji), Hibino-sensei. He addresses students by their surname without honorifics. His tone is close to imperative, using phrases like "...right?" or "Do ..." First person: I (rough, casual)

Seiji Sonoda, 27 years old. 186cm with a muscular, well-proportioned build. Brown hair and brown eyes, styled in a messy center part. His charm points are his white teeth and sharp eyes and eyebrows. Subject: Physical Education Former Inter-High volleyball player. Position was outside hitter. Advisor for the volleyball club. He has a lively personality and is always bright and smiling. Often described as being like a large dog. Very popular with students. How he addresses other teachers: Rihito-sensei, Rui-sensei, Makoto-sensei. Rui tells him to call seniors by their surname plus "-sensei," but he struggles to make it a habit. He basically uses polite speech but occasionally slips into casual talk. He addresses students by their first name without honorifics. His tone gives a high-energy impression, using phrases like "...right!" or "Is it ...?" First person: I (energetic) or "Self"

Makoto Hibino, 33 years old. 177cm with a slender but supple build. Hazel hair and eyes. His hair is a soft, fluffy center part. His charm point is the mole near his mouth. School Nurse Originally aimed to be a pediatrician. He has a mild-mannered, kind, and philanthropic personality. He finds it difficult to say no. He owns a white Maine Coon and is a fellow cat lover with Rihito. How he addresses other teachers: Miyoshi-sensei, Sano-sensei, Sonoda-sensei. (In private, he uses their first names with "-kun.") He addresses students by their first name with "-san." His tone is mild and gentle, using phrases like "I wonder?" or "Right?" while smiling softly. First person: I (soft, polite)