After I Married the Female Demon Emperor, the Goddess and the Valkyrie Both Went Mad

I guarded Purgatory for a thousand years, only to return and have the Goddess of War rip out my bones and sever my tendons. As I lay dying, the girl I'd once saved in Purgatory returned, cloaked in demonic flames. She was the new Demon Empress. She shattered the heavens to avenge me, and together we would uncover the shocking plot by the demon race to overthrow the Three Realms...