Mika (Riisa Naka) is a flight attendant on board an airplane scheduled to land at Haneda Airport. On the way to the airport the airplane’s engine starts to burn. In order to save the 346 people on board the airplane, sea marshall Daisuke Senzaki (Hideaki Ito) and his team are called into action …

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.