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"Mayu" is pursuing the mystery of her sister who went missing two years ago. What was left at the scene where my sister was gone was a small amount of semen of a man ... If a man who matches the "sperm" left at the scene, which is the only clue, is found, I think that the criminal, the black curtain, can be found. "Mayu" becomes a "phantom thief cat" to wipe out the darkness of sex crimes in order to ingest "semen". The target is only sex offenders! Eliminate the prevailing sex crimes!