第 336 集: 警方調查揭開赤井的動機，柯南則利用鈕釦線索揭露上野芳紀子為真兇。

336

The police investigate and find that Furumura's camera was turned on during the attack and reveals no suspicious sound was made. While the police suspect Akira to be the murderer, it is revealed the Akira and his two fellow employees have motives on murderer Furumura; Furumura ruined their previous film due to his careless handling of the negatives causing them a great loss in money to re-film the ruined sections. Conan calls Agasa over to reveal Akira as the murderer and to reveal Furumura's missing third shirt button had an important role in the murder. Later that day, the culprit returns to Akira's apartment to return the missing button. The police and Agasa appear revealing it was a set up to reveal the culprit to be the employee Yoshikiko Negami. Conan using his voice changing bow-tie voices through Agasa that Yoshikiko using fluorescent tape was able to cross the messy room quietly and with fluorescent paint covering Furumura's third button, was able to stab him in the heart. Yoshikiko confesses and reveals that the parts of the film Furumura ruined could never be re-filmed as one of the main side actors died. When the black car stalking them passes by, Conan reveals to Haibara he called Takagi to give the stalkers test on their blood alcohol content. Since the stalker is smoking, it means they lost track of them. (Source: Wikipedia)