Reincarnated in my own Novel as Final Boss.

My grammar is not too good since my first language is not English. synopsis:- A man died on earth and reincarnated as the final boss of his novel. But the problem is the final boss once was a kind man but fell into darkness due to some incidents in his life. To know how?? , why ??. Why you should read this novel? 1.Cause we have a milf elf, fox girl, dwarf girl, cold iceberg type girl, tsundere, yandere girl waiting for you, so you can save them from this cruel world. 2. No mindless smut, a pure romance novel and obviously some R18 stuff, an action novel, and a fast paced novel. tags:- harem, weaktostrong, netori, Villain. no ntr keep up with the story, I will try to improve my grammar.