Diego, a young trumpet player, trying to escape from reality, leaves home and begins a dream throughout the night, which will lead him to encounter people from his past life who will try to bring him back to his world, but also new people who will take him to unfamiliar places.

A boy looks at images of a story from his past, the story of an interrupted love. Cinquemarzo is the journey into the memories, moments, sounds and sensations of someone who has lost something and no longer knows how to go back or how to go forward.