Reiko (Ayumu Ito) has lived in her parents' home until she turned 40, without leaving her hometown, in contrast to her free younger sister, Arisu (Aimi Satsukawa). Now he is open only to the cat named Scarlet. Suddenly, Ayumi became pregnant from Tokyo and came back home, while the violent incident that a pregnant woman was attacked in town. A mother who was strict to me is sweet only to her sister. As the air inside the house changes, the world of Choshi collapses.