Shigeru Yoshida, a junior high school student with the temperament of a general who is quick to fight but is admired by his friends, is also known as "Oniyan.'' A free-spirited man who hates things that are twisted, he enters Tosa Minami Junior High School, which used to be a naval preparatory school. However, it turns out to be a terrifying school ruled by the discipline club, led by the leader Iwakura, who even the principal can't touch, let alone the teachers. Onyan stands up against the public morals club, which uses force to suppress the students and tries to control the school through violence. Through his growth as he fights against authority, we explore ``What should a man be like?'' ” “What is friendship? ” “What is kindness? A Bankara youth adventure action manga drawn by Yusuke Aoyagi that asks what is important as a person!