In the aftermath events of Garo: Chapter of the Black Wolf, Kouga Saezima sets out to the northern district upon reassignment. While hunting down Horrors, a young priestess named Rin informs Kouga that she has 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 Midnight Sun within Kantai to plunge the world into darkness with his "family."