The Makai fight a secret war against the demon forces known as Horrors, evil creatures that manifest themselves through darkness to devour Humanity. On the frontlines are the Makai Knights, given the task of watching over a district and eliminating any Horrors that manifest there. GARO follows the tales of the Knights bearing the title of ‘Golden Knight Garo’, and their duty to vanquish the Horrors and protect Humanity from the darkness.

Mihiro is a young girl who lost her mother at a young age, while Haruto is a father pursuing the vision of his dead wife. Both are at the mercy of conflicting love and are thrust into tragedy.