Yami o Terasu Mono takes place at some undetermined point in the future in Vol City (ボルシティ, Boru Shiti), a metropolis build around a volcano. One day, Ryuga Dougai arrives in the city, drawn in by its high concentration of evil spirits known as Horrors, the ones plaguing Vol City being Madō Horrors (魔導ホラー, Madō Horā?). Ryuga is in fact a Makai Knight and the latest knight to bear the title of Garo the Golden Knight. However, Garo's armor has mysteriously been tarnished black, leaving many questions behind the loss of his golden armor's radiance and the fate of Ryuga's predecessor Kouga Saezima.

Garo: Yami o Terasu Mono (牙狼〈GARO〉～闇を照らす者～, lit. "The One Who Shines in the Darkness") is a is a Japanese tokusatsu television series. that premiered on April 5, 2013, on TV Tokyo. Written and directed by Makoto Yokoyama, Yami o Terasu Mono is the third television series in the Garo continuity, set years in the future of the previous installments and featuring a new main cast of characters.