Series by 小沢としお

Tsuyoshi Nanba comes from a family of hardcore delinquents. He is expected to attend a rough school and become its strongest fighter. Instead, he secretly goes to an elite school and presents himself as a normal student. He keeps his fighter identity separate with help from trusted friends. That double life becomes harder when his sister chooses the same elite school.

Akira Katagiri is a new teacher who dislikes children and troublesome work. His casual attitude makes him an unlikely adult in the classroom. He faces students known for causing problems. Each school incident pushes him into situations he would rather avoid. The school comedy centers on a reluctant teacher confronting unruly kids.

A timid college student attends an elite private school and tries to avoid trouble. A rough delinquent from a lower-ranked school helps him during a fight. Their first encounter leaves the two young men at odds. Soon afterward, they learn that their parents plan to marry each other. The mismatched pair suddenly has to face life as brothers.