Birth of Legendary Warrior King

Xander, a normal boy died on earth while saving a child from accident. He was transmigrated in the body of the King of Ehterac. The world he was transmigrated to is dangerous, Demons are wreaking havoc in this world, on top of that the kingdom he was transmigrated has lowest population and economy. But he got system to help him in his adventure. Join Xander as he trample the bodies of demons.