The movie version is not a sequel to the TV series version, but a parallel story in the TV series world. Two years after the newlyweds Nana (Tomoyo Harada) and Shota (Kei Tanaka) moved into the apartment, they invited their neighbors to attend their wedding banquet on the cruise ship. Unexpectedly, a series of murders occurred on the cruise ship where there was nowhere to escape. When everyone tried to solve the case, they triggered unexpected murderous intentions...