Ultra: The Tiga statue was destroyed at the beginning

After traveling to the world of Tiga, a system is given at the beginning, but the system brings a big trouble.
In order to complete the system's tasks, Ishikawa Akira used the novice reward to reach the top of the warriors, hoping to be recognized by Ultra Black Factory, but he did not expect that the Ring of Light rejected him.
After returning to Earth, Tiga was accidentally killed by him.
So, who will save the earth?