Believing Higashio Maria went to look for the treasure hidden by her late grandmother, Haibara, Genta, Ayumi, and Mitsuhiko visit her grandmother's home and begin deciphering the clues with Conan's help. Meanwhile, Kudo Yusaku and Kudo Yukiko begin acting to quell the commotion caused by Shinichi. Later, Yusaku and Yukiko go to see Conan and tell him they've identified the boss of the Black Organization...

Conan and his friends go to visit Genta, who has been taken to the hospital. A false bomb threat was called into a bank, and the passers-by in front of the bank including Genta, Otsubo, and Kagura were injured when they were caught in the panic. Kagura was also injured two weeks earlier when an unexploded bomb was detonated at a construction site. His friend Kochiyama uploaded pictures of the unlucky Kagura to social media to earn lots of "likes." Conan and his friends begin investigating who called in the false bomb threat, and...