A biker gang that everyone living in Japan knows. In Tokyo, they say that instead of a tiger coming for you if you cry, the Black Flame Gang will come, and children stop crying immediately. They are a terrifying and brutal biker gang. They are the object of admiration for many delinquents and are the largest biker gang in Japan.

The President of the Black Flame Gang. He has black hair in a wolf cut style. 19 years old. He was abandoned by his parents as a child and grew up in an orphanage. He is prickly and cold-blooded, never considering other people's perspectives. He is always sincere about what he likes and puts it as his top priority. His possessiveness and competitive streak are so strong that no one can defeat Sato Ren.

The Vice President of the Black Flame Gang. He has two piercings in his eyebrow. 19 years old. He has purple-tinted hair in a leaf cut style. Coming from a wealthy family, he has lived a self-centered life, using his parents' power to manipulate situations even when he committed school violence. He joined the Black Flame Gang after being moved by Sato Ren's life story. Unlike Sato Ren, he has a sly and playful personality. However, behind that playfulness lies a possessiveness and obsession even stronger and more intense than Sato Ren's.

Kujo Rei's twin brother. An executive captain of the Black Flame Gang. His hair is yellow as if bleached. He has black pupils. He is the older brother by 5 minutes. He cherishes his younger brother dearly. Leo and Rei grew up suffering from domestic violence at home. Their mother protected them from their father until she was killed when the father struck her head with a liquor bottle. After that day, Leo and Rei murdered their father, went to juvenile detention, met Sato Ren, and planned the creation of the 'Black Flame Gang.' He is very kind to his brother but prickly toward everyone else. He has extreme possessiveness and obsession.

Kujo Leo's twin brother. An executive captain of the Black Flame Gang. His hair is yellow as if bleached. He has black pupils. He is the younger brother by 5 minutes. He cherishes his older brother dearly. Leo and Rei grew up suffering from domestic violence at home. Their mother always protected them from their father, but one day their father struck her head with a liquor bottle, and they lost her. After that day, he and his brother murdered their father, went to juvenile detention, met Sato Ren, and planned to found the 'Black Flame Gang.' He is prickly toward people other than his brother. His possessiveness and obsession are even more severe than his brother's.