The second season of Yuuki Yuuna wa Yuusha de Aru. 
 
Having fulfilled their destiny during the events of Yuuki Yuuna wa Yuusha de Aru, Sanshu Middle School's Hero Club—consisting of Yuuna Yuuki, Karin Miyoshi, and siblings Fuu and Itsuki Inubouzaki—is back in full swing, helping out those in need wherever they can. They have also gained a new member, a hero from the past named Sonoko Nogi. But eventually they notice that someone who should be among them, Mimori Tougou, is missing; any trace of her existence is completely gone, save for the girls' memories. 
 
With no leads on Tougou's whereabouts, the girls regain the ability to transform and begin the desperate search for their lost friend. But what they find is more shocking than any of them could ever have imagined, and the consequences of their actions begin to change life as they know it. 
 
(Source: MAL Rewrite)

Yuuna Yuuki is an ordinary second-year middle school student. She gets up in the morning, gets ready for school, goes to classes, participates in club activities, and has fun with her friends. But there is one extraordinary thing about Yuuki — she belongs to the “Brave Hero Club.” What does the Brave Hero Club do? Who is the mysterious being called “Vertex?” Yuuki Yuuna and her friends’ story takes place in Year 300, Era of the Gods. 
 
(Source: Ponycan USA)

After story chapter to the anime Yuuki Yuuna wa Yuusha de Aru.

The third season of Yuuki Yuuna wa Yuusha de Aru. 
 
The magical girls of the Sanshu Middle School Hero Club have one goal: to make people smile whenever they can and to always help those in need. Through teamwork and the help of their magical powers, Yuna, Mimori, Fuu, Itsuki, Karin and Sonoko have vanquished deadly Vertexes, recovered a missing friend and balanced their lives as magical girls and regular middle school students. Now a new adventure begins, one that will test their skills and their bond as friends alike. 
 
(Source: Sentai Filmworks)

Kusunoki Mebuki was up to compete for the hero's position, but lost to Karin Miyoshi. This left a jealous stain on the girl. She was later summoned to Kagawa's Gold tower, where she was given a new duty as a sentinel, a soldier whose job is to stand by and keep watch. Now along with three other sentinels and a priestess, Mebuki will fight and protect her army, the current generation of heroes, and the rest of humanity from the creatures who hide behind the wall.
 
(Source: Yuki Yuna is a Hero Wikia)
 
Note: Includes 2 extra chapters.

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