Karasaki

Shinmu Minowa, an ordinary office worker, is visited by his elementary school classmate, Kurofuji Mayu. Known as the Black Witch, she reveals a shocking truth to him. All their former classmates are dead. And soon, they too will die—.Transported to the past by Maiya's magic, leaving only his soul behind, Shinmu begins acting alongside classmates who also time-traveled, determined to escape their fate of death! A powerful duo's time-slip mystery begins!!

…I don't want to die. I want to be free. If a monster is what I have to become to be free, then that is what I will resign myself to. Striking the infected with incessant pain that runs throughout the body, a strange, debilitating, and deadly illness. The life of the boy who had suffered several years with this affliction had come to end with little time for him to despair as he died without an attendant by his side. When he awoke again, he had been made into the lowest ranked undead by an evil necromancer. Though the boy rejoiced at having obtained a body that could not feel pain, he immediately realized that he was still at the mercy of others. There was no large difference between his present situation and being confined in bed. However, the world could not leave the boy alone when he wished to be at peace. With freedom as his goal, what he needed was prudence and power. Occasionally running, fighting, fearful, and hesitant, this is the story of the cowardly King of Undead as he seeks to be free. Original Web Novel