
Masumi Mizusawa, a brilliant forensic pathologist returning from the U.S., joins the newly established Medical Examiner Japan (MEJ) alongside inexperienced director Maho Kiryu, and on their first case, they investigate the mysterious death of a 17-year-old boy found in just 40 centimeters of water; as the team conducts their first autopsy, what seems like a simple accident begins to raise troubling questions about whether the death was truly accidental or something more.

Under the leadership of Masumi Mizusawa and Maho Kiryu, Medical Examiner Japan (MEJ) begins operations, but the team is quickly overwhelmed by paperwork and unable to perform autopsies as expected; meanwhile, Honda reunites with his old friend Hirono, who is later found dead under mysterious circumstances, and as investigators determine he died from a fall despite no visible place to fall from, the team sets out to uncover the truth behind the impossible case.

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