Sae lives with her little sister and mom after her parents divorced when she was young. Suddenly, her little sister Yuka gets into an accident and passes away... but together with their distant father. What on earth happened to her? Sae accidentally finds her little sister’s diary and finds out that Yuka had been frequently seeing their father. She also finds out that they’ve been visiting a certain small shrine a number of times. Why did her little sister and father visit this shrine so many times? By using the mysterious powers of the shrine, can Sae return to the past to recover her broken family and future?!