Marin and Wakana have a successful first cosplay event. Because of something Wakana said, Marin's mental and emotional state starts to change a little. Even though she was just spending time at the Gojos' home with Wakana and Kaoru to wash her outfit, she can't seem to calm down. Meanwhile, a certain person comes to Gojo Dolls after seeing the photos Marin posted onto social media of her Shizuku cosplay.

Marin is going to do a group cosplay with her idol, the cosplayer "Juju," whose real name is Sajuna Inui, and they're going to cosplay as Black Lobelia and Black Lily from the magical girl anime "Flower Girl Blaze!!". Wakana heads over to Marin's home so that he can borrow the "Blaze!!" DVDs for research to make the outfits for them.

Wakana and Shinju's secret plan was a success, which added to the success of their first group cosplay photoshoot. As Juju and Shinju look through the photos from the photoshoot, the sisters find out how they both feel. Meanwhile, Marin and Wakana are enjoying their summer vacation. They were preparing Marin's cosplay for a fighting game character named Veronica-tya, but then a problem arises...