Luna and her older brother Leon were walking in the mountain like any other days but one day a thief trys to kill them. So they ran to the top of the mountain and found a cave and there is where their whole life is gonna change.
They will be separated from two worlds that they had never heard of.
The Underground; UnderTale and UnderFell.
They will have to find a way to be back together again. But in the way they will meet all the monsters, maze and TROUBLE.
Will they make it in time and be together again?? And be together forever.