A young boy discovers a magical rock that can make any wish come true. But the rock is stolen by a school bully who uses it to create a powerful and dangerous monster. The only way to stop the beast is to enlist the help of superhero Ultraman Gaia. The boy does everything he can to help the XIG Team, a brave group of humans who have direct contact with Ultraman Gaia as well as Ultraman Dyna and Ultraman Tiga.

After the battle against Zogu was over, both Gamu and Fujimiya began to live normal lives until another threat arrives on Earth - a surviving monster soldier of Zogu's army named Gakuzom.