After Kumiro’s father died in the Serene Slaughter fighting for his king, his mother took him away to protect him. She took him to Ruriksgrad where he was forced to grow up being pushed to fight for his king by his mother. He never wanted to since that’s why his father is dead, so he became a mercenary to fight for gold and after awhile he found that he liked it. Of course his mother was worried sick he decided to join the Ruriksgrad military so he could take care of her.