Co-pilot Kazuhiro (Tanabe Seiichi) is up for promotion, but before he can get his captain's wings he has to get through a flight evaluation, and things aren't exactly going his way. He just crashed and burned on a simulated flight test, and his friendly examiner has been replaced with the tough-as-nails Harada (Tokito Saburo). On the same plane is cabin attendant Etsuko (Ayase Haruka) who's flying her first international flight and trying hard to not mess up. Elsewhere in the Happy Flight universe, staff are bustling back and forth with various problems and gripes - all to make this ordinary yet fateful flight a safe and happy one.

The cyber crime investigation division at the Tokyo Metropolitan Police Department finds a video on website "YOURTUBE." In the video, a man covered by a newspaper, warns that a fire will be set at a food processing company. More crime notices are soon found involving violent crimes. Geitsu is the main guy behind the group "Shinbunshi," which has posted the videos. He used to work as a temporary employee at an IT company, but was unfairly dismissed. He then begins doing manual labor work and meets the other members of "Shinbushi."