He reveals that Mikami tied a string on the roof where it hung in front of Osamu 's window .
Conan investigates and after putting Kogoro to sleep , impersonates him and reveals the murderer to be Mikami .
Conan reveals that Mikami tied a string on the roof where it hung in front of Osamu 's window .
Conan investigates and after putting Kogoro to sleep , impersonates him and reveals the murderer to be Mikami .