Among the confirmed professions, the weakest of all is said to be the 【Summoner】. A boy named Roy, who dreamed of becoming the greatest adventurer, was given this ‘failure job’ and spent his days scorned as incompetent. However, his fate changed completely when he suddenly formed a contract with the ‘Sword of Guidance’! Together with legendary summoned beasts, he rises from the weakest profession to become the strongest in the world—!