Reborn calls over Giannini, a famed weapon tuner from Italy, to help prepare Tsuna for the fight against the Varia, but the weapons Giannini modifies are surprisingly useless. On top of that, when Gokudera visits to modify his dynamite, he becomes a child because of a badly modified Ten-Year Bazooka! Gokudera doesn`t realize that he`s become smaller, driving Tsuna crazy, and then Gokudera suddenly starts saying that there are suspicious people in places where no one can be seen…