The students investigate Mr. Momoya's past and discover that Shiro had died in a car accident, suspecting that his death may be related to Mr. Momoya's sacrifice to the Sphinxes. Ryusei awakens Spudio to help them return Mr. Momoya, but they are unable to solve Sphinx Dactyla's puzzles, causing Junpei, Ryusei, and Tsuyoshi to be eaten in succession.