Midori no Honoo

Carol decides to visit her sister Isabella who ran away and married her boyfriend Anton six years ago and moved to a city called Lenoa. So she leaves her house in New York without telling her father. She's surprised to find Lenoa is a desertic town where there are frequent sand storms. After Isabella's mysterious death, Carol decides to visit a forest which protects Lenoa from the sand storms. What secret do the trees in that forest hold?