Once in a land far away monsters and human lived in constant battle with one another.
One day, the humans locked the monsters underground.
The monsters were forgotten by the humans. Except a handful who remembered.
On her birthday a girl named Marciline was dared to climb mount Ebott by her friends.
On her way up Marciline fell into a cavern that was pitch black so she went trying to find her way out and she fell.

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Marciline Adventures With Sans
FanfictionMarciline was hiking one day when she fell down a hole and met all the magnificent creatures of the underground This is my first book and it does have mature content so beware This might be a lemon so beware for mature audiences