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.

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

A world wide electrical outage occurs. Everything that requires electricity comes to a stop. Tokyo is nearly ruined. Yoshiyuki Suzuki decides to escape from Tokyo with his family.