Nobody talks about this one. It's a five-minute fever dream where Blue Exorcist crashes into a magical girl comedy special, and the tonal whiplash is the entire point, Rin and Yukio end up in frilly outfits solving problems with pure absurdist energy instead of demon swords. The collaboration doesn't try to make sense of itself. It just commits to the bit harder than any crossover special has the right to, which is exactly why fans of both shows immediately knew it was built just for them.

Blue Exorcist and Kakko Kawaii Sengen come together in this one-episode crossover special from 2012, released in connection with the Ao no Exorcist movie. Billed as a joint project between the two titles, the special is a comedy played for laughs.