On a surface level, the premise of Promare is simple enough: 30 years ago, a new race of people called "Burnish" began to spontaneously manifest pyrokinetic abilities. Facing persecution and confinement from governments across the world, a terrorist group called "Mad Burnish" began to fight back. The conflict escalated, culminating in an event known as the Great World Blaze, which nearly destroyed the world. In the present, however, things are mostly under control. The Burnish threat is mostly quelled thanks to the work of mech-piloting, ice slinging firefighters who respond to Burnish attacks.
Following a bit of exposition, the film quickly delivers on a high-energy fight between the members of the Burning Rescue unit, who respond to an attack by the Mad Burnish in their home city of Promepolis, which is essentially a vague stand-in for New York City founded and governed by renowned scientist Kray Foresight. Eventually, it boils down to an explosive one-on-one between the film's two eventual protagonists: Galo Thymos, a rookie firefighter with a "burning soul," and Lio Fotia, the delicate-looking, but tough-as-nails leader of Mad Burnish.
This fight is the first time we get to truly see Promare's flames in action. It's clear from the get-go that these aren't your ordinary pyrotechnics: the flames of Promare are multicolored, vibrant, and geometric, composed of blocky triangles and other shapes that take on an amorphous quality when animated. The Burnish can manipulate their fire into solid objects ranging from armor to motorcycles, giving them an otherworldly quality, the backstory of which is eventually (and luckily) addressed later in the film.