The Yuki Yuna franchise is a Japanese multimedia series that includes anime, manga, and video games. It centers around a group of middle school girls who become magical warriors known as the "Heroes" to protect their world from mysterious creatures called "Vertex." The series explores themes of friendship, sacrifice, and the struggles of adolescence. The franchise began with the anime "Yuki Yuna is a Hero" in 2014, created by Studio Gokumi and produced by Aniplex. It has since expanded to include sequels, spin-offs, and adaptations, such as the manga series and video games. The characters, including Yuki Yuna and her friends, have become popular among fans for their relatable personalities and emotional stories.