Kamonohashi Ron no Kindan Suiri: Temporada 2, Episódio 9

2 - 9: The Case of the Psychological Research Lab Murder (Part 2)

Ron and Toto present their deductions to Professor Aoe and the students who use the lab. A number of inconsistencies, starting with the postmark on the threatening letter, lead to the killer's identity and the selfish reasons for their crime.