The story takes place in the era of the gods, year 300. Yuuna Yuuki lives an ordinary life as a second year middle school student, but she's also a member of the "Hero Club," where club activities involve dealing with a mysterious being called "Vertex."
 
(Source: Anime News Network)

The story takes place in the era of the gods, year 300. Yuuna Yuuki lives an ordinary life as a second year middle school student, but she's also a member of the "Hero Club," where club activities involve dealing with a mysterious being called "Vertex."

Includes the special 4koma, Washio Sumi is a Hero: Another Story.
 
(Source: Anime News Network)

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

In the year 298 from the era of the gods, elementary school girls Sumi Washio, Sonoko Nogi, and Gin Minowa are tasked with an important mission. They are to become heroes and fight Vertex, a mysterious enemy that is attacking Shinju-sama, the god tree that protects Shikoku, the only area in the world that is still habitable. What they don't know, is that this fight will cost them more than they could have ever imagined. 

Note: The first of two manga adaptations, as this serialization was eventually cancelled.

In the year 298 from the era of the gods, elementary school girls Sumi Washio, Sonoko Nogi, and Gin Minowa are tasked with an important mission. They are to become heroes and fight Vertex, a mysterious enemy that is attacking Shinju-sama, the god tree that protects Shikoku, the only area in the world that is still habitable. What they don't know, is that this fight will cost them more than they could have ever imagined. 

Note: The second manga adaptation after the first was discontinued.

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)

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.

4-koma manga based on the mobile game "Yuuki Yuuna wa Yuusha de Aru Hanayui no Kirameki”.
 
Note: Chapters count includes the chapter “Let's learn about the world of YuYuYui“.

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