J-Novel licensed Death's Daughter and the Ebony Blade, which sounds almost identical enough to this story that it borders on plagiarism... So we'll probably never get this one. Oh well.
Hmmm I only read the beginning of Ebony Blade but those two are fairly different. Only because we have two female MC and a death god doesn't mean it is a carbon copy. Oh and by the tone of what I read I see Ebony blade more as a happy go lucky kind of thing (I remind that I did not read it fully till now) and you can consider "the Girl who ate a Death God" as dark fantasy.