From Batoto:

With her beautiful looks and outgoing personality, Shinozaki Akina used to be the leader of a group of hotties on the top of a class hierarchy. After her high school debut was delayed, however, she finds herself isolated in the class.

Next to Akina sits Sasamura Kaede, an otaku girl who can turn into a bishoujo with her glasses off. Akina decides to get Kaede out of the otaku life and groom her for a perfect high school life, but the only way to get close to Kaede is for Akina to pretend to be a Precure otaku herself to her chargrin...