When the Gate opens, a world of 'Hunters', those who hunt demons, exists. Kim Woo-sup, a slingshot enthusiast, awakens as a slingshot shooter and becomes a Hunter. However, his rank is Class F. His magic power is 0.06, and even though he's a Hidden Class, he's met with sneers and glares. Until he earns points and opens a shop. Now he could level up his skills by collecting points, and this shop, with its stats and all kinds of items, could be purchased...? Can Woo-sup really become a great hunter with just a slingshot?