"Promare: Galo-hen" is a spin-off OVA of the 2019 anime film "Promare," directed by Hiroyuki Imaishi and produced by Studio Trigger. The OVA focuses on Galo Thymos, the protagonist of the original film, and provides additional context to his character and the world of "Promare." Set in a futuristic world where humanity is divided between ordinary humans and the Burnish, a group of individuals who can manipulate fire, the story explores themes of heroism, justice, and coexistence.

Galo Thymos is a member of the Burning Rescue firefighting team, dedicated to protecting the city of Promepolis from the destructive fires caused by the Burnish. The OVA delves into Galo's backstory, revealing his motivations and the events that shaped his unwavering sense of justice. It highlights his early days as a rookie firefighter, his struggles to prove himself, and his eventual rise as a key figure in the fight against the Burnish threat. The narrative also explores his relationship with Lio Fotia, the leader of the Burnish rebel group Mad Burnish, and how their initial antagonism evolves into a mutual understanding.

The OVA expands on the world-building of the original film, providing deeper insights into the societal tensions between humans and the Burnish. It examines the political and ethical dilemmas faced by Promepolis' leadership, particularly Governor Kray Foresight, whose actions and decisions play a pivotal role in the conflict. The story maintains the high-energy, action-packed style of the original film, with dynamic animation and intense fire-based battles that showcase Galo's growth as a hero.

Through its focus on Galo, the OVA reinforces the central themes of "Promare," emphasizing the importance of empathy, unity, and challenging societal prejudices. It serves as a complementary piece to the main film, offering fans a more detailed look at one of its most iconic characters while maintaining the series' signature blend of spectacle and emotional depth.