Even if it was due to enchantment, you're the only one who drove your fiancée to death, aren't you?

In a certain country, an incident occurred in which high-ranking nobles' sons were manipulated through enchantment. Though the incident itself was resolved, it resulted in the death of one noblewoman by her own hand. This is a story of a certain boy's revenge that follows. ※Please note that while not direct, there are sections that suggest cruel depictions, so please be cautious if such content is difficult for you.※ ※This is a story set in an original fantasy world created by the author, so it may differ from the history and common sense of the real world. Please understand.※