By chance, high school student Yao Wenyu learns that this world isn't inhabited by humans alone. There are also demons and half-bloods.
Half-bloods are the offspring of humans and demons. But half-bloods and demons have been at odds since ancient times, and demons cannot coexist with humanity. So half-bloods join forces with humans to root out rogue demon clans around the world.
When Yao Wenyu joins the Paranormal Affairs Bureau and sets out on the path of an operative, she doesn't know that the road ahead is full of thorns. By the time she realizes she may never reach the end, there's no turning back.
Endless darkness lies ahead, a bottomless cliff behind her, and blood runs beneath her feet...
Forward,
She can only keep moving forward...
Theme: Even if you walk the road alone, walk it well
