The Death Mansion and the Red Wall (The Late Koumei) Koumei investigates the crime scene at the mansion and realizes who the culprit is. Before he could text his answer to Yamato, he is knocked unconscious by the culprit. The building is set ablaze and Koumei is saved by Euhara. At the hospital, Conan and Yamato deduced from Koumei's incomplete text "The late Koumei" was a saying which was alluded from the Battle of Wuzhang Plains; the moral of the story is that one can have great influence even after death. They believe that the culprit murdered Akashi to avenge Aoi's death. Conan and Yamato then realize what Akashi's dying message means.