Sakura, Tamaki, Airi, and Rinrin have returned to Paradise Academy! However, something seems strange. Everyone exudes a sharp, stern aura. Tsumugi says that she senses the scent of a "Dark Quartet Star" among the four Quartet Stars. Mitsuki tries to find out the truth about what happened to Sakura and the others. Have Sakura and the other four really become Dark Quartet Stars...?
