After Saving the World, I Was Exiled for Using Forbidden Magic (LITRPG / Magical Girl / Progression / Mentor)

Samantha Campbell was the kind of girl who finally started winning and never wanted to let go of that feeling. When everything fell apart in the final battle, Samantha did something no magical girl is allowed to do. She  made a dream that wasn’t meant to be made, a self centered dream. It was a miracle called victory and the world was saved. They exiled her for it anyway. Now, in a quieter town far from the people she used to fight beside, Samantha tries to build something that looks like a normal life. Until a boy who can see Nightmares shows up at her door and asks her to become his mentor.