Seigai no Majo

In 15th-century Rome, witches are at war with humans. Nikola, whose parents were killed by a witch, learns he is essential to ending the conflict. Through years of study, he has gained magical abilities and must use them to awaken twelve witches called the "First Witches," who will aid him in battle. However, reviving them requires him to enter a marriage contract with each. The challenge lies in determining how many of these unions Nikola can form while still saving the world.