Ikebukuro is home to a diverse range of companies and gangs. Makoto Majima, the notorious "troubleshooter" who mediates between opposing groups, is one of them. Makoto is well-versed in the intricacies of the bustling Tokyo neighborhood and works hard to keep the peace alongside the G-Boys, who support Makoto in his troubleshooting efforts. The G-Boys are the most powerful gang in Ikebukuro, led by the charming and ferocious Takashi Andou. However, as the new faction "Red Angels" begins to encroach on the G-Boys' territory, tensions between them immediately flare. Makoto's ability to navigate the streets gets more challenging with so many adversaries distributed around and among the G-Boys. While continuing to troubleshoot issues, he gradually uncovers a conspiracy that might spark a full-fledged war and endanger the world.