Bible Black (Baiburu Burakku) - (adult anime) Takes place in an academy rumored to have been the base of operations for a coven twelve years prior to the premier installment. This witchcraft club practiced by school administrators black magic in a storage room in the basement. Using sexual energies of students and death to feed their practices. Special police investigators from Tokken deal in supernatural.
Character uses hands to move the mouth their clothing while speaking, while this seems like a strange quirk, it hides the fact that the character is actually mute, and operates a hidden mechanism to speak.