Y/N is a teenage girl who loves watching her brother play games because of his ridiculous commentary until one day, ge replays one of your favored games called Undertale. But unlike his previous Full Pacifist route, he decided to play a mortifying Full Genocide route and had his game possessed by Chara which he just brushed off like it was nothing. After his soulless runs , you got tired and decided to change the fate that your brother has condemned those sentient characters. All of this is for the sake of those poor AIs that you have grown to appreciate to. And by that, it meant getting you zapped out of your body and get sucked into the game you intend to save where you manage to snatch the other half of Frisk's soul and become his guardian that will stop him from doing what is wrong. Great, at least you can help Frisk subdue the LOVE that is blooming in his left chest.