A global mass disappearing event takes place among humanity. Rena and Shinjirou simultaneously vanish. In the wake of these events, freelance journalist Kotaro Higashi investigates this mysterious "disappearance incident."

The aliens behind it are the terrorist organization Dark Star. They transmit a message to those on Earth. "Give us half of the Earth, or sacrifice half of its people... make your choice." At the same time, the recently disappeared Rena and Shinjirou are teleported to the Dark Star ship orbiting the Earth.

Learning too much, Koutarou is caught in the crossfire between Dark Star and the SSSP, and is almost left for dead.... In the final battle, our heroes face off against the Golden Fortress. Facing this giant mecha destroying the city, ULTRAMAN, SEVEN and TARO are joined by ZOFFY, JACK, and ACE. At long last the 6 ULTRAMAN heroes have assembled!

(Source: Official Site)