Kotaro is enthusiastic about taking part in the upcoming toy design competition at his company, despite having a boss, Kataoka, who appears passionate but is actually an idiot who does not listen to others.

Kotaro's proposed project is deemed a success and his co-worker, Kaneko, is jealous of him. As they work together, Kotaro finds himself constantly held back by Kaneko's negative attitude and lack of productivity.

As Kotaro attempts to negotiate a toy license with manga artist Shion Miyanishi, he is thrown off by her unexpected reaction. For some reason, she seems to believe that he is approaching her with romantic intentions.

Kotaro visits the budget control department to present his plans for commercializing his project. There, he encounters stiff competition from Iiyama, who tries to outdo him at every turn, from walking faster to drinking coffee quicker.

Seeking to strengthen his relationship with his business partner, who is known to be hard to please and a sauna enthusiast, Kotaro opts to join him in a sauna session.

The toy created by Kotaro proves to be a best-seller, but it is President Enryakuji who receives the credit for its development on a televised program.

Kotaro quits his job after clashing with the president and trains as a sushi chef at his father's restaurant. However, the meddlesome landlord of the restaurant starts interfering with their business operations.

Starting a toy company was a dream come true for Kotaro. He hires Yoshida, an expert in bookkeeping, to help him secure the loan from a bank, but Yoshida's excess worrying nature troubles Kotaro.

Kotaro, now a respected company president, enlists physicist Iguchi's help in developing a toy but struggles to understand his unclear language. As a prerequisite, Iguchi suggests a survival game.

Kotaro's new product faces competition from his former company and he seeks help from a previous investor Saburo after being refused a loan. In the meantime, the toy industry in Japan is hit by a seismic event.