The conclusion of the Onyx incident meant Shu would be leaving... As his departure approached, a mysterious case emerged! The victims seem to be afraid of something unknown, and the source of it seems to be the beams released from a certain kaiju's hands. What will Shu see when he too becomes a victim? And a mysterious alien appears in the middle of the chaos!?

The alien that appeared before Yuma and Shu is called Zangill, the space samurai. According to him, the "infernal dark shogun" kaiju from another dimension is sending kaiju into this world!?

And just as he said, a kaiju army appears in the city! When Yuma and Zangill go against the kaiju, Ultraman Arc's sword strikes!