The Mansion of Death and the Red Wall (Item in Hand)

While investigating the four suspects - Conan, Ran, and Komei learn that Akashi and Aoi were avid chess fans and that Aoi was adored by all her friends. Now, they believe Naiko is involved in the murder in some way and go to his apartment to arrest him. Upon arrival, they find that Naiko has been strangled and that the culprit had spray painted a red wall.