The Immortal Witch will Trade 10,000 Lives for a Simple Wish

As the immortal witch Lich, Yuurai is reincarnated into another world in the form of a young girl. She is captured by knights for allegedly killing and toying with the princess. While enduring torture, she activates her special skill, devouring 20,000 souls and gaining the immense power of a demon lord. However, this also makes her a target for subjugation. Hunted by holy knights and top-tier adventurers, she eventually finds herself facing an army of 10,000 from the kingdom.
All Yurai wants is to live peacefully, but the chain of negativity refuses to stop.
"For the sake of my beloved comrades, I guess I have no choice but to fight."