Black Rape Special Investigator Code Name Φ Solve the mystery of the synthetic aphrodisiac campamine

Because she was cool and doesn't show her emotions, she was given the code name Φ in mathematics, with the symbol Φ that represents an empty set (nothing), but she has a passionate heart that hates evil and cherishes her friends. Recently, there have been many cases in which young women suddenly disappear. After receiving information that the international criminal organization BAR is involved in the incident, Φ breaks into the hideout, but...