Vongola's Real Sin

Vongola was once great, it is still great but in a darker and more extreme way, but it was once the name of protection and glory and love and family. And Giotto could only cuss now because it was not anymore. He watched the sin pass from one boss to another...It was only when he met the burning resolve of Tsuna that Giotto realised where Vongola's real sin lay. Full sum inside.