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Reborn is sent by Nono to teach his grandson to become Decimo but there are some problem like Tsuna is mute, traumatized, somehow know about the mafia, knows how to uses his flames but they were once sealed, Is the worlds greatest hacker and why he has a matching tattoo to reborn in the same exact spot and many more. R27, Strong tsuna, Mute Tsuna, Smart Tsuna, Adult Arco.