16 years ago, all the people living on an offshore island were killed. It was instantly covered by the government, as if nothing had happened on that night. But there were two survivors, brothers Yuuki and Yuutarou. Yuuki became a criminal who only wanted a revenge to government and Yuutarou became a priest who only wanted to live in peace. Yuutarou is then forced by Yuuki to help him find the MW chemical weapon, that killed their island that night.