Her Majesty's Dog Volume 4 (Her Majesty's Dog)

Hyoue Inugami is a powerful Koma-Oni - so powerful, in fact, that a spell of binding has been put on him! Hyoue can only remain Amane's guardian providing he never says the forbidden words... but the problem is, he doesn't know what they are! He'd do anything to stay by Amane's side, but one slip of the tongue could mean disaster. When Amane agrees to take the role of Beauty in the school's production of Beauty and the Beast, Hyoue seems perfect to play the Beast - but what if the forbidden words are in the script?