Honoo no Alpenrose

Early in the 1930s, a small child named Lundi resides in Switzerland with his aunt and uncle. Lundi comes upon a young girl who is the sole survivor of a plane catastrophe and has lost all of her memory one day while exploring the Alps. His uncle gives her the name Jeudi, and they both grow up together. Jeudi and Lundi form a close connection as they become older together. Jeudi wants to discover her past a few years later. The only thing that can help her is a song called Alpen Rose, which she can't stop hearing. Jeudi and Lundi embark on a trip to learn more about Jeudi's past during World War II in order to understand the depth of their love for one another.