In a world where mutated animals (monsters) run wild, humans have also mutated, awakening to aura. With this newfound power, they picked up their swords and protected their lives.

Time passed and humans have solidified their standing in the food chain, building kingdoms and seizing territories. In particular, seven legendary figures helped spearhead the way for humankind. However, one of them went on a dangerous exploration and was never heard of again, his sword technique disappearing alongside him.

A few years passed since the incident, humans have moved on and made further advancements. Guilds and hunting groups are formed to explore the wild and extract essence from monsters. Swordsmen became a legendary profession that everyone admires.

The story begins with Clay, a labourer working in a countryside guild. His parents were hunters who passed away during a difficult mission, leaving him behind to fend for himself. As a labourer, his job was to follow the hunter through the wild, extracting the essence from monster hearts.

One day, his hunting group fell victim to an ambush. Barely escaping, he stumbled upon a cave which he decided to seek refuge in. A skeleton and some words carved into the walls... a sword technique? No... something more?

Reading the scripture is useless for someone who hasn't touched a sword his entire life, so Clay decides to leave his mundane past behind and explore the world, becoming a swordsman.