Fics like The Unexplainable

He had only come here to fulfill a dying wish from a younger version of himself, to take his place in this world as Sawada Tsunayoshi. That had been fine, boredom plaguing him constantly in his long life as nothing seemed to matter anymore. So when Reborn arrives to train him as Vongola Decimo, he ends up with something a little more. Dark!Tsuna, Dark!Universe, eventual R27 COMPLETE!

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