Durarara!!x2 Ketsu: Dufufufu!!

An ordinary bartender named Shizuo Nobusuma hears the fearsome reputation of Ikebukuro's strongest man, Shizuo Heiwajima, and sees an easy opportunity. With a blond wig, dark glasses, and a convincing attitude, he begins impersonating the famous brawler to intimidate people and make his own life more profitable.

The disguise works far less smoothly than Nobusuma expects. Some residents recognize the fraud and play along, others simply pity him, and the real Shizuo is eventually bound to hear that someone is borrowing his name.

Then the impostor crosses paths with Izaya Orihara, the information broker who delights in provoking Shizuo more than almost anything else. What began as a cheap con suddenly places Nobusuma between two of Ikebukuro's most dangerous personalities.