'Kaishakunin' was a job in ancient Japan, describe a person who work as a helper in an act of 'hara-kiri'. There were some criticized about they committed murder in the name of justice. Is he a deviant who guided for those who are in pain to regain the ultimate dignity of life? Can you see the truth?

A young Ph.D. in physics from Cambridge, was found seppuku and beheaded in the hotel room. A handwritten suicide note was also found in the hotel room.

Is it a murder? Is it a suicide?
A Inspector smells the unusual atmosphere of this suspicious murder case. After persevering in the investigation, he discovered that 'Kaishakunin' was behind many suicide cases.

He follows the clues to trace, and the truth that subverts everyone is about to be revealed...