Roy dreamed of becoming the greatest adventurer, just like the hero who raised him. But his dream was shattered when he was granted the [Summoner] class—a job considered the absolute weakest because no one had ever managed to form a contract with a summon. Unable to unlock his power, Roy was relegated to the life of a guild errand boy, his hopes fading with each passing day. His fate takes a dramatic turn when he finally forges a pact with the "Sword of Guidance," a legendary summon weapon that awakens his true potential. Now, wielding the power to command legendary beasts—from a mole that swims through the earth to a dragon wreathed in hellfire—Roy's journey can finally begin. Alongside a party of unique allies, he'll overcome every obstacle and rise from the world's weakest summoner to its undisputed strongest!