That revenge was meh, if you want to make someone suffer you make that person suffer, a personality is former by the passage of time and the memories we get when we grown up, if you erase all memories then isn’t the same person anymore, I don’t see the point, only pure perversion, like raping or making suffer the daughter of your dead rival, it’s quite sick, and I don’t mind, if they want to make a pervert crazy mc okay, he is out of the book alright, but don’t expect me to take him serious if he suddenly acts like a decent and typical isekai mc