H2O: Footprints in the Sand, ef: A Tale of Melodies. Recommendations
Both stories have characters that have a dark past and a protagonist that loses their loved one and meets her again.
There's a mysterious girl with a shocking secret in both shows,also there's a lot of drama and romance involved.
These two shows share a common sense of feeling to it. In both shows, the main character is someone who is trying to help a someone whom they come to love. both endings leave you speechless