Sae lives in the countryside with just her mother. Sae had an older sister, but she passed away from illness on the day Sae was born. The name of the deceased sister is Rei. As Sae grows older, she begins to look more and more like Rei. One day, when her mother falls ill, Sae goes to pray at the mountain deity in the hills behind their home. There, she encounters a mysterious girl named 'Rei'. Warm and tender familial love transcends life and death and time, enveloping the three of them in true love!
