Nagano PD’s Kansuke Yamato and Yui Uehara have been alerted that a researcher was attacked by a hooded figure at an observatory in the Yatsugatake Mountains. During the investigation, Kansuke starts feeling a strange discomfort in the eye he injured during an avalanche 10 months ago. Meanwhile, Kogoro is contacted by his former colleague Sametani, who claims he is investigating Kansuke’s avalanche incident. They agree to meet but Sametani is shot and killed by someone in front of Kogoro and Conan. To get to the bottom of this incident, Kogoro heads to Nagano, and Conan begins investigation assisted by Amuro and Kazami.