All this time, for as long as Tohru's known him, Kyo has been harboring a secret from her, a secret tightly maintained by others in the Sohma family as well, a dark secret Kyo'd do anything not to reveal. Master Kazuma, true head of the family and a beloved father figure to Kyo, returns after a long absence. He sees a significant change in the lad and soberly decides upon a course of action that'll cause much pain.
—statmanjeff