The carefree Makoto enjoys taking wagers at a bowling alley and getting into mischief with friends in Ikebukuro, where someone evil is on the prowl.

When a precocious boy Makoto knows from the streets of Ikebukuro is kidnapped, the boy’s mother asks Makoto to help both her son and his abductor.

Unable to turn to the police, Chiaki enlists Makoto’s help in protecting her boyfriend from the yakuza after he angers a dangerous drug dealer.

A former classmate requests that Makoto help hunt down a creepy stalker who is relentlessly harassing a woman from an amateur voyeur website.

After an unexpected reunion with an old friend, Makoto must find the missing daughter of a desperate yakuza boss — or else lose a finger.

When Makoto hears about his mother selling some strange tea, he and Shun sneak into a pyramid scheme seminar in disguise to investigate the situation.

A group of aggrieved high school girls accosts Masa at the bowling alley, threatening him and demanding cash for a classmate who needs an abortion.

Suspicions turn toward the G-Boys after Kana is stabbed by someone dressed in yellow. Meanwhile, the Black Angels declare war in Ikebukuro.

Takashi takes more dramatic action in the aftermath of Shun’s tragedy, causing the battle between the G-Boys and the Black Angels to intensify.

Finally free from police custody, Makoto hears about Rika’s part-time job dating men for money and the suspicious figure who stopped by her funeral.

Makoto hides himself away at home as the showdown between Takashi and Kyoichi approaches — until a new development sends him running to the police.