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"Remember you must die."
It was taboo to contract your soul to a demon, but Tsuna did it anyway. If he had to sell his soul to the devil for his revenge, then so be it. He just didn't expect to cause a stir in the deepest pits of Hell later on. It was fine—he could improvise.
It just so happened that these demons were more unpredictable in their own right.
Cross-posted from FF.