Shinichi, Ran, and Sonoko are at movie director Akihiro Nagata's villa where Shinichi is practicing for a possible role in one of Nagata's films. Nagata's wife and famous actress Chisato becomes jealous and enraged when she catches Nagata "demonstrating" a kiss on rising actress Saori Kisaragi and even threatens her with a knife. Nagata calms Chisato down as villa manager Kana Ishihara prepares tea for the group. Suddenly, Nagata collapses from poison in his tea and Chisato suffers a shock so great that she loses her memory! It's up to Shinichi to reveal the truth, find Nagata's murderer, and prove whether or not Chisato has truly lost her memory.
