While hiking, Yuka, Yumi, and Takao get lost when a huge UFO crashes in front of them. The alien Genius who was riding the UFO is a villain who plans to rule the universe, Takao was captured, and Yumi's body was taken over! On the other hand, Yumika, who has escaped, borrows the power of Caro, a righteous Space Police detective who is chasing Genius, and becomes a "Galaxy Police Cannon" with menacing physical abilities! Will the Galaxy Police Cannon be able to save Yumi, Takao, and Earth from the crisis!?