Sayo lives alone with her mother in the countryside. Sayo had her older sister, but she died of illness the day Sayo was born. Her deceased sister's name is Rei. Sayo is like Rei's reincarnation, and the older she gets, the more she resembles Rei. One day, her mother fell ill and Sayo went to pray to the guardian deity of the mountain behind her. At that time, Sayo meets a mysterious girl, Rei. When a gentle and warm family love overcomes life and death and time, true love envelops the three of them!
