Unnatural — Season 1

A man died suddenly. His parents ask UDI for help. It is rumored that his girlfriends, a researcher, created a poison to kill him.

A family committed charcoal burning suicide. However, it turns out that one of the bodies died from hypothermia and was found a piece of paper in her stomach.

Mikoto Misumi is asked to testify in a trial for the prosecution. However, pretty soon she discovers inconsistencies in the case.

Misumi's mother comes to her to ask for help in a case where a man died in a road accident.

Misumi's team works to find the truth behind an apparent drowning accident.

When Yuko gets entangled in a murder investigation, the UDI department steps in to help her.

A high school student defies Mikoto Misumi to discover the truth behind the death of another student.

UDI has to discover the identities of the victims of a fire that could have been an arson.

UDI investigates the death of a young woman found in a suitcase, a case that may be connected to the death of Nakado's girlfriend 10 years ago.

After the fallout of the previous episode, UDI has to find proof of the involvement of Takase in the deaths of 26 people.