Washio Sumi is a Hero

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)

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.

Washio Sumi's Hero Radio is the spin-off Web 4koma to promote both the light novel and movie version of Washio Sumi is a Hero. "Washio Sumi's Hero Radio" features Washio Sumi, Nogi Sonoko, and Minowa Gin.
It consists of 30 chapters and 9 bonus chapters.

Chapters 1-6: Washio Sumi wa Yuusha de Aru Gaiden: Yuusha Koushinkyoku
In this humorous, slice-of-life spin-off of Washio Sumi is a Hero, Sumi, Sonoko, and Gin set out on an adventure to return a lost puppy to its owner.

Chapters 7-9: Kaettekita Washio Sumi wa Yuusha Radio

Chapters 10-11: Yuusha GP
"Hero Grand Prix" is a cross-over that includes the characters from Yuki Yuna is a Hero, Washio Sumi is a Hero, Nogi Wakaba is a Hero, and Shiratori Utano is a Hero.

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“.

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)