The Struggle of a Half-Elf, from Slave to Demon King

My name is Yurisaro, and I am a half-elf. On the first day of apprenticeship, my master was killed by the brave man. As the demon king's apprentice, I was sold by the brave man and became a slave. Now I'm locked up in a dungeon and a human merchant bought me. Looking at his wretched expression, I felt that my subsequent life as a slave would definitely have a terrible negative impact on me, who was pure in heart and delicate in body. "Charge! Defeat them!" Yurisaro stood in the advance guard composed of prisoners of war and criminals, holding a spear with a dull expression. Very scary indeed.