A group of Friends write letters to their past selves saying to help a friend. Keep him alive.  Naho is the first girl we meet.  She is timid and shy, and just so unsure of herself. But her letters say to do these things to keep her friend Kekeru.  10 years in the future Naho is married and has a child with her other friend Suwa.  They both get letters with orders to change the future.  This graphic novel has a well written story and great illustrations.  Sometimes it was a bit hard to tell which time panels were in, but overall very well done.  Saying that, this story was not for me.  I do not like sad books.  The reader knows pretty early on that Kekeru’s mother commits suicided and that something happens to Kekeru.  I just didn’t care for it.  I’m glad I read it, but I will not be continuing the series.