On a sweltering summer day, Makiko travels from Osaka to Tokyo, where her sister Natsu lives. She is in the company of her daughter, Midoriko, who has lately grown silent, finding herself unable to voice the vague yet overwhelming pressures associated with adolescence. Over the course of their few days together in the capital, Midoriko's silence will prove a catalyst for each woman to confront her fears and family secrets.
On yet another summer's day eight years later, Natsu, during a journey back to her native city, confronts her …