A man is looking for his missing girlfriend in Tibet.

Backed into a corner by mounting debts, a youth agrees to submit himself to a high stakes game of chance in international waters aboard a disused warship.

The film is based on the best-selling suspense novel "The Long Corridor" by Keigo Higashino. There are countless secrets hidden in the cloister pavilion mansion. After the rich merchant died of illness, a fire murder case that occurred a year ago was revealed, involving the first heir of the estate, that is, the illegitimate son of the deceased, making the distribution of the estate complicated.

A man becomes involved in a memory manipulation operation to try and regain lost memories. He thinks the exercise may help repair his failed marriage, but accidentally ends up with the mind of a serial killer.