In this unknown anime; (one episode I think) There is a book the main characters find about a girl and boy who are in love. The boy leaves for war and dies. The girl visits a shrine/prays to statue (Time goddess?) to give the boy her life instead. The boy comes home, finds her dead, kills himself and both disappear in a rain of shimmer. BUT this is the story that is told to cover up the real story. In the true story there are three friends a girl and two boys. The boy and the girl love each other. The “other boy” loves her 2. Before the 2 boys go to war the “other boy” prays to the time goddess for his friend to die in the war. After he dies in the war the girl wishes to give her life to the boy she loved. What anime is it from?