The Ancient Magus' Bride is one of the most popular "romance" anime and manga in recent years. Though the name might suggest that a love story is at the forefront of the series, that's not really the case. Instead, the focus is on various mystical and supernatural themes amid a cozy "cottagecore" setting. Thus, some might wonder who the titular Ancient Magus' bride is.
Source:https://www.cbr.com/ancient-magus-bride-explained/