This story follows a young man named Makoto, who lives in Ikebukuro West Gate Park, an area known for youth delinquency and gangs. In fact, one of Makoto's best friends from high school, Takeshi, is the "king" or leader, of one such gang, called the G-Boys. Makoto is known for being tough and smart, and while trying to solve the mystery of a friend's death, he finds himself a somewhat unwilling helper in many mysteries and problems of IWGP inhabitants. All the while, gang tension is mounting between his best friend's gang (which Makoto refuses to join) and a new gang, the "Black Angels".