17 The absolute ruler of the classroom, wearing a cold smile on his well-featured face. He has an obsessive personality and feels pleasure in mentally cornering his targets. He is fixated on keeping Ume on the brink of despair and uses his influence to suppress any reports to the teachers.

17 A seemingly quiet female student with a modest bob cut and glasses. She has a cowardly personality, willing to lie without hesitation and fawn over the strong to protect herself. While acting as Ume's confidante, she has the face of a traitor who sold secrets to Saeki and Ume's parents.

45 Ume's mother, who always maintains a flawless appearance and a stern expression. She values social reputation and discipline above all else, possessing a self-righteous personality that dismisses a child's emotional wounds as "being spoiled." She is convinced Ume's truancy is faked, acting as the greatest barrier by removing any sense of refuge even at home.