Ossan, Yuusha to Maou o Hirou @ Comic

An old man is forced to retire from the adventurer's guild and decides to return to his hometown. On his way, he picks up two babies; the first one is a human baby with the emblem of a hero, and the second was a baby of the demon tribe with the emblem of the demon king. And so the story of the old man who picked up the hero and the demon king begins.