Frisk spared King Asgore on his last bit of health. Frisk was leaving to escape only to find himself being held back from guilt. The guilt of murder. He needed to right what he'd wrong. "I want to fix my wrongs. I believe that the monsters need to be free to experience the surface once again." Before Asgore could respond Frisk destroyed the barrier. Majority of the monsters left the underground to enjoy living with the humans. While others stay for their own reasons. Sans refused to leave the Underground and leave his deceased brother behind. He thought that he would never want to trust another human again. Until he met you.
4 parts