Manga A-Rank Boukensha No Slow Life

Oldrerd is the leader of the highest ranked royal squad, successfully completing the mission of slaying the dragon. However, Oldrerd was always based on strength, but after killing the dragon he lost his purpose in life, because there was no longer a strongest creature that could compete with him. While he was pondering for a very long time about his future, he saw a special vision in which he was shown the peaceful village in which he lived once upon a time. As a result, he retires and goes to this peaceful place to spend the rest of his days there.