Precocious high school student Jimmy Kudo uses his keen powers of observation and astute intuition to solve mysteries that have left law enforcement officials baffled. Hot on the trail of a suspect, Jimmy is accosted from behind and fed a strange chemical which physically transforms him into a grade schooler! Taking on the pseudonym Conan Edogawa, he attempts to track down the people who did this to him. But until he finds a cure for his bizarre condition, Jimmy continues to help the police solve their toughest cases. Can you crack the case before Conan does?

Note: VIZ Media changed the title to Case Closed and changed the character names for localization. In June 2026, VIZ announced a 3-in-1 Edition which will use the original title and character names instead.