Two heartbroken parents bring their case to the UDI Lab since ther are unable to accept that their healthy son's sudden death was caused by coronary heart disease.

The UDI team discovers that one of the victims in a group suicide might have actually been murdered - and there may still be another victim.

In place of a retired colleague, Mikoto agrees to serve as an expert witness at the trial of a husband accused of murdering his wife.

When a father working long hours in a factory dies in a motorcycle accident, the UDI team must determine who is ultimately at fault.

Mikoto learns something shocking about Nakado; a widow asks the UDI team to look deeper into his wife's cause of death.

Shoji becomes a murder suspect after she wakes up next to a dead man; Mikoto and the rest of the UDI team fight to clear her name.