Yuukoku no Moriarty: “Hiiro” no Kenkyuu

William is intrigued when a man in a tavern sees through Moran's cheating and challenges him to a game of poker for a large sum of money. There's also an over-zealous Louis who names the tropical fish he's assigned to keep "William", Albert and Moran compete in a wine-drinking contest, and John becomes a detective instead of Sherlock, and shows off his famous (?) deductions. The daily research records that were not shown in the main story are released for the first time!!

(Source: Shueisha, translated)