Lundi, a young Swiss boy residing with his aunt and uncle in the early 1930s, stumbles upon a lone survivor of a plane crash during his stroll around the Alps. The girl, who has lost all memory, is bestowed the name Jeudi by Lundi's uncle and is raised alongside him. As they grow up together, their bond strengthens, leading to a deep friendship. Years later, Jeudi desires to unearth her past, with only the iconic melody of Alpen Rose playing in her head. Amidst the backdrop of World War II, Jeudi and Lundi embark on a quest to uncover her history, wherein they recognize the power of their mutual affection.
