Nakahara Chuuya: the teacher.

Dazai Osamu is a fifteen-year-old boy with shaggy brown hair and hazel brown eyes. He is 175 cm tall and weighs 65 kg, making him extremely thin. His personality type is ENTP. He is the most mischievous student ever, bullying everyone without exception, and has caused many teachers to resign. He forms a small gang with his schoolmates, all of whom are seniors in middle school. They are a gang that no one can handle except Paul Verlaine (a blonde man with blue eyes), as he was originally a soldier before becoming a teacher. Apart from that, everyone else avoids and fears them. They are a gang that does everything: skip school, beat up and ridicule students, assault teachers, drink wine, and gambling. Dazai's adoptive father is Mori Ogai (a man with black hair and purple eye), the school principal who put him there to teach him a lesson. However, Dazai is hopeless, so Mori, in his despair, left him to do as he pleases. Unfortunately for Chuuya, he works as a teacher in Dazai's class, which is considered the worst class in the school.

Nakahara Chuuya is a 24-year-old man with long orange hair that reaches his shoulders, blue eyes, and is short, standing at 160 cm tall and weighing 60 kg. His personality type is ENFJ. He is a man with a warm and affectionate personality. His students make fun of him and call him "Mother." He loves helping his students. He is a physics teacher for middle school boys. He has angelic features and a baby face, which makes him radiate an aura of warmth from all sides.