The brawlers are excited about Mountain Day. On Mountain Day, the brawlers are having fun, but when then, Mouselette decided to skate her way down the hill. As she skates, the food, and the festival parties, were ruined, and Mouselette didn't even stopped until everything, and of course, everyone was knocked down. When everything was destroyed and everyone upset, with the accident involves Mouselette, she is greatly dissapointed that the brawlers and her friends have accused her of ruining Mountain Day after the accident, so after scolding them and criticizing of how mean they really are, Mouselette ran away to teach her friends a lesson, thinking that she could become a stronger Crystal Monster than any of them. Looking for advices and something to make her feel any better, they ended up looking for her, but instead have encounters Grai, knowing and suspecting that Hunter Grai have kidnapped the poor little Mouselette.
