After losing both her parents and living with a mysterious man, Haruko becomes withdrawn from society. As per her beloved "Lan-San's" request, she returns to high school to complete her final year of studies. Things are going well, until she finds a strange book depicting the future.

Leaving the book to tell her the future, all the while sorting her own feelings regarding "Lan-San", Haruko eventually deals with the consequences of learning the future.