In the neon-lit, chaotic district of Kabukicho, Tokyo, a tenement run by the enigmatic Mrs. Hudson houses seven peculiar individuals, among them the brilliant and eccentric detective Sherlock Holmes. The Case File nº221: Kabukicho OVA is a collection of six short side stories that expand the world of the main series, offering glimpses into the past and present of the detectives and their associates. Rather than following a single overarching plot, these episodes delve into the everyday lives and hidden depths of characters such as Holmes, his partner John H. Watson, the calculating and mysterious James Moriarty, the sharp-witted Fuyuto Kyogoku, and the earnest Torataro Kobayashi. The narratives shift between lighthearted moments and deeper explorations of personal histories, with particular focus on Moriarty’s background—shedding light on the motivations and circumstances that shaped the series’ central antagonist. Set against the backdrop of the underground bar Pipe Cat, where cases are brokered and the detectives gather, the OVA provides a more intimate look at the bonds, rivalries, and secrets that define the residents of the detective tenement. Through these compact vignettes, the OVA enriches the larger story of the main series—a modern reimagining of the Sherlock Holmes mythos set in Tokyo’s most vibrant and dangerous entertainment district.