Beyond the Boundaries: Get me home

The wall was build to protect human from monsters like witches and wizard, Vampires, and other entities, but before the walls was build, the humans are friends with the entities even having married, having a job that only human can do, and even in the government.

But one tragedy swoop up the people's fear and break the relationship between entities and humans, and when they found out that witch did it, they kick them out of the village. Now the walls was build to protect humans from the supernaturals and never know what is on the outside, though they are still jobs as a scavenger where they will go outside the walls and collect some resources.

Ellen En is the princess inside the walls, and wants to experience and see the outside world, but she never let her father (Zodorow En) go outside, but one incident made her see the outside world, experience it, and meet a girl named Nierr.

Now Ellen is stuck in the outside world and wants to go back. Will Nierr help her or Ellen will help her?