Heroes who will rival Marvel's heroes have arrived! The space police who protect the peace of the universe. Due to prolonged peace, the space police have become complacent and allowed the universe's greatest villain, Serpent, to infiltrate Earth. Space police officers are dispatched to Earth to catch Serpent. What they urgently need is to find the Space Guardians who disappeared from Earth long ago... With the help of Kai, an Earth boy they meet by chance, They succeed in finding the Space Guardians one by one... However, can the inexperienced and mistake-prone space police defeat the cosmic villain Serpent and the Devil Monsters, and save the fate of Earth and humanity?