In Blazing Teens II, Millie joined the Lightning Squad because in the ending of the first movie, Millie's father was killed by evil forces. Millie felt extremely sad and wanted to find a way to take revenge. After joining the Lightning Team, Millie continued to train hard to improve her combat ability, hoping to avenge her father. At the same time, she hoped to become an excellent athlete and lay a solid foundation for her body and soul. The recognition of the Lightning team and the guidance of the coach also allowed Millie to achieve a lot of success in training and competition and become an excellent athlete.