Remia, my sister, was engaged to the crown prince. However, due to the crown prince having a child with another one of my sisters, Remia was pressured to end her engagement. She refused, and today, she was poisoned by our parents. Why did Remia, who had strived for ten years, have to die? Unable to accept it, I used forbidden magic to return to the past. This is a story of a brother taking revenge on the family that drove his sister, Remia, to her death. It's a common reverse-regression story. I wrote it impulsively because I suddenly felt like writing a reverse-regression story. It was meant to be a short story, but it became long, so I'll divide it, but I'll upload it all at once. There are cruel depictions, so those who dislike it should protect themselves. Thank you for the many typo reports. I received wonderful reviews. Thank you. Also, thank you for the many comments.