Although GARO -VANISHING LINE- is part of a much larger franchise spanning multiple TV anime, live-action tokusatsu TV series, films, and video games, you don’t really need prior experience with these media to understand the central conflict: demonic entities known as Horrors possess and devour human beings, and the Makai Knights and the Makai Alchemists do everything in their power to slay the Horrors and keep the world safe.
It’s also a bold move to make the ultimate villains of GARO -VANISHING LINE- a stand in for Silicon Valley billionaires.