Tsunayoshi "No-Good Tsuna" Sawada's life is in shambles. He has poor grades, unhealthy fitness levels, and no social connections. After discovering that Kyouko Sasagawa, his crush, was already seeing someone else, he had no reason to attend school. However, little did he know that the blood of Giotto, the great Vongola the First, runs through his veins. Enter Reborn, an infant who claims to be the world's greatest hitman. Under orders from Vongola the Ninth, Reborn has come to train Tsuna to become a worthy successor to the famous Vongola Famiglia name. Despite refusing, Tsuna insists that he will never become a mafia boss. How will Reborn react to such opposition? Will he force Tsuna to comply or use his unwillingness as an advantage? This is the story of a reluctant successor who takes on the responsibilities of becoming the underworld's next ruling mafia leader, with the help of friends and a unique home tutor.
Katekyo Hitman Reborn! was published in English as Reborn! by VIZ Media under the Shonen Jump Advanced imprint. 16 volumes were published from October 3, 2006 to July 6, 2010 before release was discontinued. It was also published in Brazilian Portuguese by Panini Comics/Planet Manga since February 2013.