“What happens when a Saintess, who knows nothing of love, comes to know it? She becomes a yandere.” In the kingdom, there lived a man named Laurent, often labeled as a failure. Born to excellent parents, he, however, possessed no remarkable talents of his own. The only thing he could boast of was his immunity to epidemics, a trait he had since childhood. Yet, one day, he discovered a mysterious door. Beyond that door was a beautiful woman… She was known as a Saintess. Why was she in such a place, and how did he find her? When Laurent learned the answers to these questions, he also discovered the hidden power within himself. And the Saintess…