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A member of the Police Department's First Investigations Department who investigates the mysterious murders connected with Amanae. During his investigation, he expresses an obvious dislike of Kiyotaka and the admiration most of the police department has in Kiyotaka, believing that Kiyotaka's abilities are more demonic than divine. Saiki is an acquaintance of both Kirie and Madoka, who he has apparently known since before she married Kiyotaka considering that he still refers to her by her maiden name out of habit. When Amanae is apprehended as a serial killer, Saiki maintains suspicion that the events involving Amanae have not fully concluded. (Wikipedia)