Gunner has had a happy life in Ultimate. Making new friends, participating in exciting battles, and so much more. It was all good... Until a Sans Mii Gunner outfit was given to her. Ever since that day, everyone started acting as if she never existed, all they cared about was Sans, they seem to have forgotten the fact that it was just a costume and treated her like the real Sans whenever she put on the outfit. It was then, that Mii Gunner has had enough of this, and now she will make sure that everyone will pay.