Zeztz "Case21: Burst": The dream-RPG plot blows up into a massive real-world crisis, the first time a Nightmare has manifested in reality since episode 3. It's powered by multiple kids having the same dream inspired by a popular computer game that features Nem's hero character in advertising. (How the heck does that work? They must be using a virtual Nem, if this is a new game. Although I keep wondering if we'll find that the bad guys holding Nem are somehow behind all the ads and videos she's in.) The CGI settings and real forest location of the game are joined by the perennial Oya Caves museum location as the final boss's temple.
We finally get to see Kureha transform (or "Disguise") as Lord Six, though along with the hotheaded Lord Five guy from last week, whom I don't much care for.
This episode definitely follows the Inverse Ninja Rule. Zeztz generally needs a lot of effort to defeat a single Nightmare, but now there's a whole horde of them that he can take down with one hit each. But at least they established last week that the Baby Nightmares are weak compared to normal ones, so it's more justified than your usual Inverse Ninja situation.