Sleeping Dead

Sada is a high school teacher who is well-liked by both his students and colleagues. He is earnest and pleasant in nature. One day, while on patrol after school, he comes across a female student who is being attacked by someone with a sharp knife. Despite his attempts to flee, he tragically loses his life. However, to his surprise, Sada awakens on a cold table. It's worth mentioning that the first five chapters were initially published under the name "Living Dead," but as soon as the first volume was released, the title was changed to "Sleeping Dead."