Koshino Natsuko (Summer in English Dub) is a girl in the same class as Nagisa and Honoka. One day she and her friend, Mori Kyoko, decide to cosplay as the Pretty Cure, leading everyone to think they are them, however until they found this out, Nagisa and Honoka thought they had been discovered. As they are only cosplaying, the girls do not have any powers or abilities and are normally seen pretending to play hero for younger children.
Poisony decides to use this against the Pretty Cure and kidnaps them and threatens to harm them if the real Precure do not show up and hand over the Card Communes.
After this little episode, they continue to cosplay as Pretty Cure.