People Make up for Regrets in Terra

You lied to me! I lied to all of us! So what? Look at how downcast and helpless you are now, exactly the same as when I first picked you up tens of thousands of years ago, stained. Now it's time to rest and say goodbye to you silly little kitty. Thousands of years later, Kelsey opened the envelope left by that person. There is only one short sentence in the letter: "I'm deeply sorry for cheating on you, kitty. You know I can't commit suicide because of the curse, but one person between you and me must disappear on this continent. For this reason, I would rather that person be me..."