Tantei Gakuen Q EP10 - The Beautiful Boy Genius - Exposing the Perfect Mystery Room

Two students are dead. All the victims have been Class A members. Megu questions the existence of another person in the island, since the only things taken from the kitchen were butter and flour - certainly nothing enough to feed a person and Dan concludes that the murderer is among them. Even as Kyu is remains bothered by the shoe prints, Ryu solves the mystery of the double locked door room. Kyu gets re-affirmation from Ryu that the shoe prints are suspicious as they are too clean. They are approached by Shiramine, who tells them that Gouda is missing and leads them to Dan. They all go outside, and find an open window on the 5th floor, with a bloody arm, which is pulled back into the window even as they are watching. Leaving Megu and Yukihira behind along with Maki, they all run to the 5th floor, to find muddy shoe prints again leading to a room where Gouda lays murdered, his body cut apart into more pieces. The group gets depressed thinking they are only waiting for their own deaths, when Kyu bucks up, remembering why he wanted to be a detective. This makes the group reconfirm their resolve, as they get together with Ryu to solve the murders.