Sophia Keren, formerly known as Negishi Shouko in her previous life, is one of the reincarnated students. She was reincarnated as a True Vampire in a noble human family, the Kerens. Her relatives are normal humans, so she hides the fact that she is a Vampire.

Spoiler

Sophia works for the demons as a soldier of the 10th Demon Army under direct orders of Shiro to hunt the various clones of Potimas.