The next day, Kogoro reunites the four suspects to the scene and Conan sleeps him. The culprit made a trick to shot the gun automatically, by tying the weapon to a chair with strings, heading to a mirror made with aluminium in front of the room. The front of the gunshot will react to the light of the mirror and shot to the victim. Why the culprit did this mechanism? Because he needed to create an alibi, so the culprit is the only one with an alibi, Naoya Akaike. The proof is that he pretended that the victim had a dentist appointment and also pretendet to cancel it, because if he knew that Tawake will die, there was no point into doing one. The motive is that he used all of his students as ghost-writers and wanted to free everyone.