Mae is Frisks babysitter shes 18 and a very kind sweet girl that loves Frisk like a sister and does babysit a lot so one day Frisk and her go up the legendary mountain to explore but end up tripping and fall into a big hole in the mountain they land in some flowers and meet a friendly flower on the way that warns them of the UnderGround as they meet very nasty monsters but one catches Mae's eye will they get back home ?