Yuji Igarashi was born in a small village on a Kozakuran island. He was the friend of Miyako Takahashi, who was protected by the Hawthorne Guild member Lei Feng. He accompanied the group of adventurers who went to rescue Miyako and help her on her journey to save their village.
Thanks to his training with Swolic Ironside, he learned to do something Swolic used to do, but somewhat differently. Where Swolic could channel his anger to become stronger, Yuji learned to channel his anger and use it in such a manner that it would make him more dexterous.