On a massive luxury cruise ship while at sea, the loyal butler and a mysterious woman cross paths as they try to uncover a murder-mystery that occurs on the ship.

Three murder cases take place in Tokyo. Numbers are left at the murder scenes, possibly hinting at where the next murder will take place. An investigation begins of the serial…

On July 27th, university student Aoi Hinata (Miwa) has an accident. When she wakes up, Aoi Hinata finds herself in a classroom from one week before the accident. At that…