Damn it! Why did this never happen in the show?

Because Mizushima shows always fall short in the second half.

Is Luise refering to the part where it looks like Saji's <cencor>ing the haro.
If not then the joke half flawed.

Bbbuuuttt the joke's author might not have known about the drama-cd and the second part of the joke (The Nena bit) is alright so no big deal I guess.