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Female Special Investigator Φ (Phi) She was given the code name of the symbol Φ, which represents an empty set (nothing) in mathematics because she is cool and does not show emotions, but she hates evil and cherishes her friends. I had a hot heart. Recently, there have been many incidents in which young women suddenly disappeared. Φ invades the hideout after receiving information that the international criminal organization BAR is involved in the case.