They're known as the Parasites. The information he gathered about them online says that they--like him--harbor parasites and are born with the right to kill others.
在網路上，他認識一批跟他有共同興趣的人，暱稱「共生蟲」，根據他在網路上取得的知識，體中養著「共生蟲」的人，如上原者，天生有殺人的權利… …。