When I Was Ten Years Old, I Watched Demon King Destruction Summon the Brave and Became a Celebrity.

Traveling through farmers' households, they lived through several years of inhumane peasant life. Nine years old, In order to escape the suffering of his original family, he took the mercenary assessment in advance. Ten years old. Following the large mercenary group, they came to the royal capital and found that a hero was summoned. However, when they saw the new demon king, they destroyed the hero's summons and killed the hero. Already red and warm. I, who have an undying feud with the Demon King, will work hard to become stronger and sound the final death knell for the Demon King.