Mizuhara Sana is the wife of a man who runs a small-town factory, tirelessly prototyping rocket engine components by hand. His dream is to one day launch a rocket using an engine he built himself—a dream Sana has always supported, sharing in the hope and ambition. Then one day, a sudden offer arrives from Musashino Heavy Industries, a major corporation, proposing to purchase the patent for her husband's plug system for 2 billion yen. As the one managing the factory's finances, Sana must weigh her husband's lifelong dream against the enormous sum of money and decide which path to take. That decision will drastically alter the course of both their futures.