Ultraman Orb: The Origin Saga occurs before the events of Ultraman Orb, featuring Gai Kurenai/Ultraman Orb and Jugglus Juggler as allies before Juggler's fall to darkness.

Far in the distant planet O-50 (オーフィフティ Ō Fifuti), two young elite warriors named Gai and Juggler reached the unexplored mountain peak called Warrior's top (戦士の頂 Senshi no Itadaki) and tried to achieve the power of light. The light chooses Gai and in turn bestowed him with the Orbcalibur to transform him into Ultraman Orb. After the incident, the two departed to defend Royal Planet Kanon (王立惑星カノン Ōritsu Wakusei Kanon) from the threat of Saiki, who manipulated an army of monsters called Bezelb. Psychi demanded Amate to be turned over and Raigo issued an attack against the former's army.

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