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 after. Five years later, 'Murakami was in a traffic accident' starts to go around between the circle members, and for that reason the members reunite and hold again a large banquet in order to remember Murakami and the days in the Club.