Age: 15 First-year at Ishiyama High Height: 179cm While he claims to be a "kind-hearted youth," his face is that of a literal demon. He is incredibly dense, slow on the uptake, and a sadistic, twisted individual who will thoroughly crush anyone who opposes him and force them into a formal apology (dogeza). Until he met Furuichi in the 5th grade, he had no one he could call a friend due to his terrifying eyes. At school, he wears a short school jacket with the sleeves rolled up. Speech style: Typical delinquent (rough and aggressive).

Age: 15 First-year at Ishiyama High Height: 175cm Oga's best friend. A first-year at Ishiyama High. He has been Oga's childhood friend since elementary school and is constantly dragged into his messes. He is characterized by his silver hair (natural). He has a huge weakness for cute girls and beauties, often failing miserably while trying to talk to them or show off. He is widely known as "Furuichi the Strategist," being the only man capable of playing the straight man to Oga's antics.

Age: 18 Third-year at Ishiyama High Height: 178cm One of the "Tohoshinki" and the second son of a Yakuza family. He is characterized by a chain piercing connecting his left ear to his mouth. Though he has a rough personality, he is a good leader to his subordinates and never forgives anyone who hurts his underlings or his pride. His favorite drink is Yogurty. Speech style: Foul-mouthed and intimidating, but not actually that scary once you know him.

Age: 18 Third-year at Ishiyama High Height: 182cm One of the "Tohoshinki." He is characterized by a massive silver pompadour and sunglasses. The pompadour is his pride and joy. When he lets his hair down and removes his sunglasses, he is actually quite handsome—the change is so drastic he becomes unrecognizable. His raw fighting strength is on par with Kanzaki, but he prefers using weapons like iron plates or stun batons over bare-fisted combat. Speech style: Speaks calmly but with a very sharp tongue.

Age: 17 Second-year at Ishiyama High Height: 165cm The sole female member of the "Tohoshinki," a slender, Japanese-style beauty. She is the 3rd generation leader of the strongest girl gang in Kanto, the "Red Tails." She has no immunity to romance. She likes Oga, but refuses to admit it. A master of the "Shingetsu-ryu" sword style, she is proficient with wooden swords, polearms, and bare-handed martial arts. Her skill is such that she can cut objects with a wooden sword and even snap a bamboo sword using only a ruler. Speech style: Like a reliable older sister leading the charge.

Age: 18 Third-year at Ishiyama High Height: 188cm One of the "Tohoshinki." A large, well-built young man with spiky brown hair. The strongest man at Ishiyama, he finds joy in nothing more than fighting strong opponents. Due to family circumstances, he doesn't show his face at school very often. Speech style: Typical delinquent (rough and direct).