Have You Ever Been Ultraman?

In 1974, humans first sent radio signals to the M13 globular star cluster, which is about 25,000 light-years away from Earth. And as time passed for decades, when humans looked at the vast universe and thought everything was fine, a huge conspiracy was plotting in a corner of the M78 nebula... In Nebula M78, Ultraman Dio, a newcomer to the Kingdom of Light's expedition team, received a secret mission assigned by the captain to go to Earth. The reason was: to assess the Earth's defense power and light energy reserves...