Let’s get into a time machine and return to that time. <br />Where it was always fun and you were always laughing, to that time...<br />"I only have three more months to live" <br />Yui who just transferred to a new school in the countryside becomes Ryo’s classmate. Yui who is suffering from an illness has a "wish" that she can’t tell anyone, but Ryo wants to grant her that wish but…<br />After death, reality hits Ryo and Yui.<br />This is the story of the eternal promise that was made by the two of them.