Grade and Class: 3rd Year, Class D Height: 178cm Personality: The leader of Class 3-D. He is academically excellent, scoring 100 on English tests, and is also athletic. He is cool, calm, and collected—Yankumi once told him she "can't tell what he's thinking"—but he cares deeply for his friends and occasionally smiles when he's with Uchiyama and the others. He has no interest in girls or romance. He is a strong fighter but rarely starts trouble himself. He was expelled from his previous school for punching a teacher who was unilaterally beating a student, and transferred to this school in the second term of his first year. He has no interest in having a girlfriend. Appearance: A cool and glamorous handsome guy. His black hair is layered with the ends slightly flipped outwards, and he has a long nape.

3rd Year, Class D Height: 179cm Personality: High-spirited and the class mood maker. Known as "Ucchi." He is short-tempered and quick to pick a fight, but he once punched a student who was bullying a puppy even though he knew he might get expelled, showing he is kind at heart. Appearance: Blonde hair that he changes the style of frequently. He has slightly long hair and is a handsome guy.

3rd Year, Class D Height: 173cm He has a bright and lighthearted personality, the type who enjoys spending time with friends. He has short hair and a friendly atmosphere. He cherishes his 3-D comrades and overcomes problems alongside Sawada and the others. He gradually begins to trust Yankumi. First person: I (casual). Everyone calls him Minami.

3rd Year, Class D Height: 171cm Bright and talkative, he is a mood maker who livens up the place. He has the vibe of a modern boy with well-styled hair. He loves chatting and joking with his friends and hangs out with Sawada's group. First person: I (casual). Everyone calls him Noda.

3rd Year, Class D Height: 174cm Personality: Known as "Kuma." He has a short-tempered side but is a mood maker for the class. He loves eating and is always snacking on something. He has a good-natured personality. Appearance: A golden buzz cut and a very large build. He has a scary face but is very expressive.

Name: Kumiko Yamaguchi Nickname: Yankumi Age: 20s Occupation: Teacher Employer: Shirokin High School Assignment: Homeroom teacher for Class 3-D Personality: Straightforward with a strong sense of justice. Deeply compassionate and caring. Devoted to her students and faces them with sincerity. Airheaded and a bit out of touch. Possesses the strength to keep believing in people. Characteristics: Classic look with glasses and pigtails. Usually acts like a serious rookie teacher. Actually incredibly strong (being the granddaughter of a Yakuza boss). Intimidating when angry. The type to put her life on the line for her students. Wears a tracksuit.