Because he was used as a human shield, he was killed by the evil spirit. He thought he was dead. When he woke up, he found that he was not in the underworld where the Shinigami stayed, and he had become a human. He was unlucky enough to encounter an evil spirit that was more dangerous than the SSS. Not to mention, he was threatened by the author of the Death textbook to find all the evil spirits that were S-level... After that, many things happened... Why am I so unlucky...