Review Detail of Niizawa in The Vulgar Mortal [BL]

This is one of the most descriptive novel's I've ever read. The descriptions of the background and of the scenery gives a holistic view of the world, giving readers a sense of the world just at the beginning few chapters. The main characters have a lot of chemistry, but also contains a lot of mystery, such as what happened in their previous lives and when their were dieties/demons? Such myseteries are not yet explored in the novel but I'm looking forward to it.