Ultraman Geed runs into trouble when he is unable to defeat the mechanical menace, Darklops Zero. Help arrives in the form of Ultraman Zero, but is he willing to see the son of his arch-enemy Belial as an ally.
The resemblance between Ultraman Geed and Belial has the public afraid of their new protector, making Riku question whether or not to use his new powers. Meanwhile, a mysterious woman with a sword is hot on the trail of marauding aliens.
Kei Fukuide, the enigmatic sci-fi author, invites Riku, Laiha, and the Igaguri family to a special lecture regarding his newest book. But things aren't what they seem, and it seems to spell trouble for Ultraman Zero.