In order to investigate Sangami (Junpei Yasui) in detail, Auri (Marie Iito) and Takizawa (Yuka Kageyama) went to the laboratory of Osamu Horinouchi (Hiroshi Nagano), a university professor and criminal psychology expert who received assistance from Sangami Company.Horiuchi has written several papers on crime in Thailand.According to him, Yamagami wanted to make Japan's criminal investigation methods useful in Asia from an international perspective, so he began to provide assistance to him.Horiuchi also participated in the institute's investigative work as a criminal profiler.

While Shuri and others were talking, Horinouchi's graduate student Kadokura Nagisa (Nonuchi Maru) came to the research room.Zhu Li noticed that Nagisa's body showed a green color that represented “fear”.

When Akuri and Takizawa were about to leave Horinouchi's laboratory, a murdered male body was found on campus, causing a commotion.The victim was a student named Nobuyuki Inagaki (origin of Beppu).Inagaki was hit on the back of the head with an axe, and both his wrists were missing.The way he was killed was very similar to a serial murder case that occurred 30 years ago.The murderer in the case was arrested and executed.

After investigation, it was discovered that Horinouchi had written a paper about the incident 30 years ago.Soon after, Horinouchi confessed to killing Inagaki.

Horinouchi told Juri and Takizawa in detail his motives and methods for killing Inagaki.Facing Horiuchi who calmly talked about brutal murder, Shuri saw the orange color that represented “expectation”.When asked about her relationship with Inagaki, Akuri observes a change in Horinouchi's color.It seems that Horiuchi is hiding his true motive...!?