Lexi, a 19-year-old girl, poor, with a life full of difficulties, writes lyrics and music in a notebook. Before an important meeting that can change her life and in which her notebook would play a crucial role, Lexi loses the notebook.

Aribelle (Ari) is an amnesiac teenage girl stranded in a dangerous metropolis, Lost City, with only the clothes on her back and a heart-shaped locket. She meets Hugo, a very resourceful orphan kid who becomes her best friend. In a rather amusing situation Ari borrows the name Lara because he can't remember her real name. The action takes place in two cities, Capital City and Lost City, before the accident and after the accident in which Lara loses her memory and ends up in Lost City. The two, Lara and Hugo go through all sorts of adventures and end up at the city orphanage. Fausta, the director of the orphanage, is truly evil and has her own plans for Lara and Hugo.