Ultraman: the Lost Warrior

I am a newbie and will try my best to write good works. Some earths are protected by indigenous Ultraman, while other earths can only rely on the weak bodies of humans to resist the darkness. Why is there such a big difference? There is no native Ultraman to protect the Showa Earth. Why is this? Let's learn about the existence of Earth's native Ultraman. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.