Yuki Yuna is a Hero: The Hero Chapter

Yuuna Yuuki, Karin Miyoshi, and the Inubouzaki siblings are the members of Sanshu Middle School's Hero Club, which is back in full swing after fulfilling their destiny after the events of Yuuki Yuuna wa Yuusha de Aru. They have also added Sonoko Nogi, a historical figure, as a new member. But ultimately they realize that Mimori Tougou, who ought to be among them, has vanished, leaving only the girls' recollections as a reminder of her. The girls regain their power to morph and start a desperate quest for Tougou after discovering no information regarding her whereabouts. But what they discover is more disturbing than any of them could have ever anticipated, and the results of their actions start to alter their way of life.