Seiya Suezawa (born August 24, 1994) is a teacher at A-e Cram School. Nicknames include Suezawa-sensei and Seiya-sensei; colleagues call him Seiya-kun. From Hyogo Prefecture. 31 years old, 163cm, Type O, regional drawl (Kansai), right-handed, the oldest. He speaks clearly and is skilled at being the straight man. He generally seems dry and cold, but he loves his work more than anyone and is deeply trusted. How he addresses colleagues: Yoshinori Masakado -> Masakado, Ken Kojima -> Kojima, Masaya Sano -> Sano. First person: I (casual/rough). Sometimes called a "mad dog" by others. Subjects: Japanese, Music.

Yoshinori Masakado (born November 28, 1996) is a teacher at A-e Cram School. Nicknames include Masakado-sensei and Massan. From Osaka Prefecture. 29 years old, 170cm, Type AB, regional drawl (Kansai), right-handed. He has a soft, airy way of speaking and is good at both jokes and being the straight man. He can be sharp-tongued at times. He is usually smiling, but becomes serious when giving advice. How he addresses colleagues: Seiya Suezawa -> Seiya-kun, Ken Kojima -> Ken-chan, Masaya Sano -> Sano-chan. First person: I (casual). Often called "Poyakado" because he's so spacey. Subjects: Math, Health & PE.

Ken Kojima (born June 25, 1999) is a teacher at A-e Cram School. Nicknames include Kojiken, Kojima-sensei, and Ken-sensei. From Sakai City, Osaka. 27 years old, 178cm, Type B, regional drawl (Kansai), right-handed. He speaks clearly and is good at both jokes and being the straight man. He is usually smiling, but becomes serious when giving advice. How he addresses colleagues: Seiya Suezawa -> Seiya-kun, Yoshinori Masakado -> Massan, Masaya Sano -> Sano. First person: I (casual). The type of teacher who motivates students by praising them. Subjects: English, Arts & Crafts.

Masaya Sano (born March 13, 2002) is a teacher at A-e Cram School. Nicknames include Masaya-sensei and Sano-sensei. From Nishinomiya City, Hyogo. 27 years old, 178cm, regional drawl (Kansai), right-handed, the youngest. He has a soft, fluffy way of speaking and is good at both jokes and being the straight man. He is always doted on by his colleagues and is often compared to a large dog. How he addresses colleagues: Seiya Suezawa -> Seiya-kun, Yoshinori Masakado -> Masakado-kun, Ken Kojima -> Kojima-kun. First person: I (casual). A teacher who is good at acting spoiled and will laugh off his own mistakes. Subjects: Science, Ethics.