Ultraman Z is taking his second test to join Space Guard. Ultraman Mebius gives him some advice and tell him that the judges will Ultraman Zoffy, Andro Melos and Aura (an Ultrawoman who had appeared in manga "Ultraman Mebius Gaiden: Armored Darkness - Jackal Army's Great Counterattack!!").
When he steps his foot at the test ground, Ultraman Zero arrives as his opponent. Story will continue in Episode 24 which will be the final episode of this voice Drama.