Mitsuko Murakami puts the passion to balloon in the hot-air balloon Circle "Airheads". The club gathered young people holding a variety of thoughts. But "Airheads" is disbanded not too long. Five years after their time in the Balloon Club ended, the members' former club leader brings them back together and rekindles old flames.

Kasumi Sawaki (Honami Suzuki) works for a top-ranked newspaper publishing company as a capable economic reporter. Speaking six languages fluently, she vigorously performs research and interviews. Her fiance, Ishii (Shingo Tsurumi) is an elite in the same company. Although her work and love seem to go very well, she is suddenly relegated to the minor Sports Department which is full of strange colleagues.

A quiet woman receives a social media request from a middle-school friend, who she doesn’t remember fondly. The two meet at a hotel’s restaurant where they find a room numbered 666 containing Rokuroku, a long-neck woman wearing a red kimono.