Conan is attacked by a theif attempting to break into a safe and trapped inside a coffin. Kogoro is hired to find the person who stole Karahashi Gotaro's will and narrows the suspects down to his three children. Conan uses his DB badge to contact Ai and the others and tells them the coffin he's trapped inside is being transported by a hearse. Mitsuhiko hears about the case Kogoro has been hired to investigate from Ran and deduces that it must be related to the robbery Conan witnessed. Ai and the others realize Conan is inside Gotaro's coffin, but the hearse is already on its way to the crematorium...

Nakatsu was suffocated and pressed face-first into concrete. Kuchiki, the man collapsed beside him, denies killing Nakatsu and claims an alien in a UFO killed him instead. Even a nearby security camera captured the shadow of what seems to be a UFO. Conan visits Kuchiki's house with Detective Chiba and Kogoro to question him. While there, Conan discovers something in the room and realizes the reason behind Kuchiki's strange actions. Later, Conan confirms the appearance of the UFO with Yona, who claims to have seen one. Having closed in on the truth, Conan gathers everyone to conduct an experiment...