In Ikebukuro, the lives of its residents continue to intertwine as though their destinies are preordained. Mikado Ryuugamine has moved one step closer to his aim of living an exhilarating life, and consequently, penetrates further into the darker underbelly of Ikebukuro. After securing absolute control over a former rival, he wields his new authority as he sees fit, purging the Dollars from within to reshape it into his ideal organization. This task proves as difficult as it sounds, since Mikado must now contend with unwanted outside interference, most notably a re-emerging and dearly missed friend. Meanwhile, Izaya Orihara still has schemes in store, although a rival information exchange center has proven to be a significant hindrance, lurking within everyone's favorite downtown district. Undoubtedly, sooner or later, chaos will strike again.