In the aftermath events of GARO: Chapter of the Black Wolf, Saejima Kouga sets out to the northern district upon reassignment. While hunting down Horrors, a young priestess named Rin informs Kouga that she's been sent by Priest Amon to save a presumed dead friend in the Makai realm within Kantai, Jabi. Kouga teams up with Rin in a quest to save Jabi as they are hindered by supernatural and Makai forces alike. Meanwhile somewhere in Japan the dark Horror lord Legules was resurrected and plots a means to alter a supernatural event called White Night within Kantai to plunge the world into darkness with his "family." It's the final chapter of GARO as Kouga puts his life on the line to save Jabi and defeat Legules before the world is ruined.
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.
A team of teenagers with attitude are recruited to save Angel Grove from the evil witch, Rita Repulsa, and later, Lord Zedd, Emperor of all he sees, and their horde of monsters.