What Don't You Understand

What Don't You Understand manga :

The peculiar story of a writer, a boy, their pets, a hitman, and some old wizard and just when you thought you had it figured ou.
Ale, a man of high reputation among those in the Dark Arts is hired by a famous horror novelist who goes by the name of Nero. Their first meeting is a bit of awkward.
Nero, finds himself in a bit of a predicament. The body that once was his (whether he liked it or not) is no longer his, but this isn't your typical transformation story.
The entire world is transforming around them. What seemed like a simple solution spirals into this tangled plot. Supernatural forces are at play. The Dark Arts, will they be friend or foe? Well, what don't you understand?