Is Shitamachi Rocket coming back?

Kohei Tsukuda worked as a researcher at the Japan Aerospace Exploration Agency. He now runs a family-owned factory that manufactures small engines. His daughter Rina is a high school student. He doesn't get along well with his daughter, but the family owned business is improving. Kohei attempts to develop a rocket engine, which is a lifelong dream for him, but it causes his factory to suffer.

One day, an important client stops ordering from Kohei's company. He tries to borrow money from the bank, but the bank declines his loan application. To make matters worse, a rival factory sues Kohei's company for patent infringement. Kohei and his employees face a dire situation.

At this time, a large company offers a deal to Kohei. The company wants to buy their patent for 2 billion yen. Kohei must decide whether to sell the company's patent or follow his dream.