When they were little, Helck and his younger brother Cless lost both of their parents. One day, Cless gets very sick and Helck begs for someone to save him.

Only half a month after Cless departs on his expedition, monsters begin to appear in greater numbers than ever before. The kingdom enacts a military draft to combat them.

Zeruzeon reveals the kingdom’s terrifying plan, so Helck and his friends sneak into the castle to put a stop to it by saving Cless.

Helck is on the verge of being killed. To save the life of his big brother, Cless is forced to make a choice.