MamaYuyu

An era of peace between the hero and demon lord is upon us! In this peaceful world, the hero Corleo is nothing but an empty suit. But one day, a hero and demon lord from another world appear before him! How will Corleo deal with the chaos these invaders bring to his world?! A new type of fantasy epic now begins!

(Source: MANGA Plus)

Notes:
-Volume 3 contains two extra chapters.
-Volume 4 contains three extra chapters.