The Hero Club's Peaceful Days

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)

A peaceful and cute 4-koma set in the world of the game "Yuuki Yuuna wa Yuusha de Aru: Hanayui no Kirameki" (YuYuYui) where the Heroes and Mikos of every era come together!

(Source: Kadokawa, translated)

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.

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.

The story of Nogi Wakaba wa Yuusha de Aru takes place 300 years in the past, in 2018, the first days of the Divine Era. The six main characters form the first ever Hero Team: Nogi Wakaba, Nogi Sonoko's ancestor; Uesato Hinata, Takashima Yuuna, Koori Chikage, Doi Tamako and Iyojima Anzu.

Includes:
Chapter 0: Ni-satsu-me no Yuusha Gyoki (The Second Hero Diary)
Volume 1 extra chapter: Shiratori Utano wa Yuusha de Aru (Shiratori Utano is a Hero)
Volume 2 extra chapter: Takusareta Baton (The Passed Baton)

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.