Pandora Hearts Vol. 24 (manga)

Someone once said that all they would find there was darkness that swallowed everything whole. But that never meant that light was nowhere to be found.

They finally arrive at an answer to the question of how to save their world. It is the product of many months, even years. Cruel yet kind, it is a simple formula. Now, led on by the cogs of destiny, it spells the end of but one story...as if it were no more than a ridiculous fairy tale.