This drama tells the story of Riko Komukai, the second daughter of the Komukai family who works as a temporary worker in Tokyo. She is caught between the capable eldest daughter and the free third daughter. She grew up as an average child. The death of their grandfather brought the three sisters together, and after four years, the whole family finally reunited. While sorting out her grandfather's belongings, Riko found a half-made plastic model. She met Miyabi at the "Yajima Model Shop" that her grandfather often visited during his lifetime. Under his guidance, she began to try to make plastic models. Through the plastic model, Riko got to know her grandfather and his family a little bit, and she decided to stay in her hometown during the summer to make up for her grandfather's regret.