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."
Ritsuko has been doing well in the Dream Connection pyramid scheme, but she's been acting very strangely. Indeed, other Dream Connection members are behaving oddly too. Perhaps there's something in the tea.
Chiaki has a problem. Her boyfriend, Ali, is being hunted by local drug dealers. She asks Makoto to help.
Makoto thinks that Yamai is troubling Hikaru, so he asks Takashi and the G-Boys to watch her apartment. Online dating site girl, Asami, is being stalked by the sinister "Su-san". Can her transgender boyfriend Shou protect her?
The G-Boys welcome their 300th member and the police are starting to pay close attention to the gang. Hikaru and Makoto meet a boy called Hiroki, whose interest is numbers, but Hiroki soon goes missing. Makoto and Takashi must rescue him and return him to his family.
Kana reveals her dark side. Yamai pays a visit to Hikaru. Masa is pursued by a gang of Yamanba girls who demand a large amount of cash to pay for an abortion, claiming that he has impregnated one of their friends. Meanwhile, the Black Angels are muscling in on the G-Boys' turf.
Shun is acting strangely and Masa sees Hikaru meeting Yamai. The Black Angels boost their membership and are now serious rivals to the G-Boys. The police seem to be taking sides in the dispute between the gangs.
Skirmishes are breaking out between the gangs and there are fatalities. Kana reveals the identity of her attacker. Makoto discovers Hikaru's mental disorder and police chief Yokoyama organizes a major battle.
Rika's killer is finally revealed, so too the reason for Kana's stabbing. The G-Boys and Black Angels meet for a final battle and Makoto is the adjudicator. Takashi finally runs out of patience with Makoto.
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