Hisahiko and Raki found Halloween Shuten.

Also, this was a joke several months in the making.

Jarlath said:

Also, this was a joke several months in the making.

Not intentionally though, it's more that the official event called Shuten 'Onicure'

DreamFromTheLayer said:

Not intentionally though, it's more that the official event called Shuten 'Onicure'

But the Ptecure look of lancer Ibaraki definitely feels like a teaser for this, as did Hisahiko making her like Precure enough to emulate it.

So Ibaraki officially being a Precure fan is funny in hindsight because of this, and how Shuten now runs with it.