Doufu Mayoi 
Black Summoner: Volume 15 [EPUB ebook] 

The battle against Dark Mel for the fate of the world has reached its climax and the action is heating up as Kelvin and his friends struggle to deal with her latest and most impressive transformation yet. Do they even stand a chance of winning against such a powerful opponent? And after everything is said and done, what will happen to Dark Mel and the once-great goddess? The stakes are high, and it’s anyone’s guess as to whether Kelvin will have to make his way through the world without half of the love of his life—or if he will soon be too dead to care.