Living in Ikebukuro — an area infamous for juvenile crime, 21-year-old Makoto Majima becomes associated with a youth gang called the G-Boys. A troubleshooter known for his cool headedness and ability to get things done, Makoto diffuses tense situations around Ikebukuro to keep his friends and others out of harm's way. However, the mysterious death of his girlfriend and an escalating gang turf war threaten to be more than Makoto can handle.

Kurisu has always admired his father, who runs a tax accounting firm, and dreamed of working with him one day. To broaden his skills, he joined a major tax firm, but a professional setback left him disillusioned. His life takes an unexpected turn when he meets racehorse owner Sanno Kozo, reigniting his sense of purpose.

Natsumi takes a job at Kitchen Macaroni, a family-run restaurant known for its omelets, pretending to be the fiancée of the owner's eldest son. Though initially met with skepticism by the staff and family, she gradually wins them over.