Prologue: Memory

As far as Undertale players know, Frisk really wanted to save Asriel. However, he refused accepting her kindness and mercy.

This story takes place a year after the true pacifist ending. Humans and monsters lived in peace and ended the tragic war. It's been a whole year and Frisk still missed her friend. Although her friends and family always found ways to cheer her on, knowing that the poor child was the only one that she didn't get to save made an aching hole in her heart that can never be filled.

One day, Frisk got the news that Asriel came back to the surface. After a reunion filled with tears, the story of the famous ship today has only just started.