Monster Girl Uprising

One day, Michael's life was turned upside down by the plague known as "Aira's Fervor" reaching his village. A heinous thing that strips people of their morality and pushes them into depravity and reckless hedonism, he found it hard to reconcile with the kind goddess Aira, he slipped away to an old shrine he found to pray and meditate on the situation. He wasn't prepared to have a meeting with the twin goddesses themselves, nor for them to name him their champion and task him with eradicating the curse. He was even less prepared for them to strip him of both his humanity and manhood, and for them to endow upon him the name of the most infamous sinner and heretic in all of history. The cure for the curse, is, apparently, to turn people into monster girls. Now, Maia finds herself having to spread the cure, all while fighting against the forces of the curse's architect, a mysterious "enemy" that supposedly gains power the more people know about it. Note: This series is darker in tone than my other works. Please read the foreword and content warnings before reading the rest of the series. — Description from novelcodex.org