Strange event Investigation Bureau Supernatural Event Investigation Bureau, referred to as SEIB. The most mysterious organization in the empire is even more mysterious than the National Security Bureau. It belongs to an external force and its personnel files are all secrets among secrets! SEIB is divided into four groups, and members of each group do not know that each other is from the same organization even if they face each other. Even the members of some groups do not know each other and are strangers to each other.