Eiko Hayase and Mamiko Fuji are the signature flight attendants of Nippon Airways. Their appearance and personalities are vastly different, but they joined the company in the same year and are roommates, so they are best friends and partners that no one knows about. However, these two flight attendants are involved in various incidents on the flights without realizing it. First, a female passenger on the same flight was killed, but the suspicious husband was having a drink with the crew at the bar when the murder occurred; a couple of passengers committed suicide by committing suicide; it was found out that they didn't know each other; it was a rare occasion that they met someone they knew on the flight, but they didn't realize that a simple greeting would lead to a strong intention to kill them... They walked to their room, and the sound of opening the door lock came from behind them.