200 years ago, gates to another world where unknown monsters existed suddenly appeared all over the world.After many sacrifices, the adventurers who gained power from their skill cards finally vanquished the demon king.Adventurers have now become a star occupation, procuring resources from other worlds and magical tools that sleep in dungeons.Yusuke Kukutsu, who was robbed of her first girlfriend by such an adventurer, becomes an adventurer himself in order to look back on his ex-girlfriend.His occupation was an item master...a non-combat occupation.An exhilarating upstart adventure tale in which a rogue with an unfortunate skill becomes the strongest!!