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

A bittersweet coming-of-age film based on a novel dealing with forestry. Yuki Hirano wants to live an easy life, like working a part-time job after his high school graduation. But, after his high school graduation, Yuki hears from his homeroom teacher that he has been hired for a job. When Yuki gets home, his mother is packing his stuff. Yuki's mother and his homeroom teacher decided that Yuki will work as a forestry trainee after his graduation. Yuki will have to go Kamusari Village. Since then, Yuki begins to work as a forestry trainee and becomes assimilated with the beauty of nature and the warm-hearted people in the village.

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.