After missing one hint after another, Conan finally gets a clue and remembers where he first met Sera, the girl detective with the mysterious past. Flash back to a childhood trip to the beach and watch young Jimmy Kudo track down a robber with the help of a very unusual family.Then Mr. Moore gets into a battle of wits with a mystery-loving sushi chef, and the Detective League investigates a murder at their new teacher's condo building. Which of these cases will bring Conan another step closer to Rum, second-in-command of the Men in Black?