Conan, Haibara, Ayumi, Genta, and Mitsuhiko visit Teitan Elementary School to take care of the rabbits. The man they encounter there sees Haibara and asks if she's Miyano Akemi's younger sister Shiho. His question frightens Haibara, but he is Teitan Elementary School graduate Murata Sho. His former classmates Yanagimachi Gaku and Ichihashi Seiko join him, and Conan and the Detective Boys learn Akemi attended Teitan Elementary School. The graduates planned to dig up the time capsule they buried when they graduated, but only Akemi knew where it was buried...