In the spring, when Kashiwazaki Yui and her 3 years old son were coming back home from kindergarten, she let go of her son's hand for a moment and then he was gone. 9 years later, her son appears in front of her again.
Overview：In the spring, when Kashiwazaki Yui and her 3 years old son were coming back home from kindergarten, she let go of her son's hand for a moment and then he was gone. 9 years later, her son appears in front of her again.
