Himitsu Sentai Metamor V

Fourth-grader Sakie Shinjō has just transferred to a new elementary school at the start of the semester, but any hopes she may have had for a normal school life have been quickly dashed. She's run into a strange woman in the hall cosplaying as a nurse, gotten involved in a battle on the playground with Baron Dandy of the Adonis Empire, and finally been recruited by Space Detective Shatner, the leader of the transforming justice squad Metamor V, as the second-generation Metamor Red.