It has been half a century since humanity colonized Mars and established an advanced, AI-powered society there. At the heart of this new civilization is Alba City, where everyone seeks greatness. Aiming to reach such ambitious heights is 17-year-old Tuesday—a gentle, aspiring musician who has run away from home, armed only with her precious Gibson guitar.

While wandering through the bustle of the capital, a captivating song draws Tuesday to Carole, a tenacious girl playing her keyboard on the streets. While at first glance the girls could not be more different, their genuine love for music unites them in their endeavor to conquer the arduous path to success in Mars' challenging music industry.