黒ミサ

黒ミサ、Black Mass

The blasphemous parody of the Christian rite and defilement of holy substances alleged to occur during the witches' Sabbat. The ceremony and its diabolical rituals were supposedly held over the body of a naked woman, preferably her buttocks.
http://www.occultopedia.com/b/black_mass.htm

In Christian tradition Black Mass is the name given to a ceremony supposedly celebrated during the Sabbath, which was a parody of the Christian Mass. Its main objective was the profanation of the host, although there is no agreement among authors on how were hosts obtained of profaned; the most common idea is that they were profaned by means of some ritual related to sexual practices. Authors also disagree on which rites were performed during the ceremony.wikipedia.en

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