The conflict between Aizen and the Minato brothers reaches boiling point, as they duke it out in public view. A mysterious woman who is definitely not the missing mother shows up and summons an even more powerful Horoboros, to the surprise of all three Ultramen.
Geiz and Tsukuyomi decide to shadow Sougo even while he’s at school, which means all three of them are sucked into a mystery around an unbeatable game. Sougo decides the only person with the skills to complete the game is the mysterious gamer know as ‘M’…
Not content with having his pizza cutter stolen, Aizen targets Rosso and Blu while they’re having a family picnic. He challenges them to a final exam to prove who is the better Ultraman, before summoning a furry for them to fight.
After a bad training montage and the discovery of a new power-up, Rosso and Blu ask Ultraman Black Black Black Black for a rematch.
Another Build returns, forcing Geiz to fight a rearguard while Zi-O attempts to find the solution from Sentou and Banjou.
Blu, emotionally wounded after almost killing a friend as Ultraman, cannot transform. He later overcomes the problem because he’s the hero Japan needs. Aizen, sick of the duo’s poor showing as Ultramen, transforms into an Ultraman himself and beats the stuffing out of them.
An ex-police officer and friend shows up at the Minato household for their once-every-four-years rock paper scissors tournament. Due to Aizen’s meddling, she later becomes a monster and almost dies.