The Holy Grail of Eris, Vol. 4 (manga)

Constance Grail has finally abandoned her sincerity and devoted herself to Scarlett Castiel's revenge. Now, what awaits her is a subpoena delivered in an ominous envelope. Summoned to an investigative committee known as the Silent Ladies' Tea Party (hosted by none other than Deborah Darkian), Connie must stand up for herself in a twisted trial of lies and malice. Will she face punishment for her sins...or will she manage to pass judgment on the scheming women who are out for her head?