Reborn!, known in Japan as 
Katekyō Hitman Reborn! (家庭教師ヒットマンREBORN! Katekyō Hittoman Ribōn!?, "Katekyō" being a portmanteau of Katei Kyōshi and translated as Home Tutor), is Japanese 
manga written and illustrated by 
Akira Amano. The plot revolves around the life of a young boy named 
Tsunayoshi Sawada, who finds out that he is next in line to become the boss of the most powerful 
Mafia organization called Vongola, the 
Vongola Family. As such, the Vongola's most powerful 
hitman, a gun-toting infant named 
Reborn, is sent to tutor "Tsuna" on how to become a respectable boss.
The individual manga chapters are serialized in Japan in 
Weekly Shōnen Jump. The individual chapters are collected and published in 
tankōbon volumes by 
Shueisha, with twenty-seven volumes released as of October 2, 2009. 
Viz Media licensed the series for an 
English language release in North America, shortening the series name to 
Reborn!. An anime adaptation of the series by 
Artland aired on 
TV Tokyo between October 7, 2006 and September 25, 2010. There have also been various video games based on the series, as well as two 
light novels by Hideaki Koyasu.
Reborn! has become one of the best-selling 
Weekly Shōnen Jump manga with several of its volumes becoming top-sellers in Japan.
 Reviewers from the series praised its use of comedy as well as the designs used for the infants characters.
 They also mentioned that though it has become more violent since volume 8, it has turned into a better 
shōnen series, praising the storylines and the fights.
Plot
The 
Reborn! story revolves around a boy named 
Tsunayoshi "Tsuna" Sawada,  who is chosen to become the Vongola Family's boss due to him being the  great-great-great-great grandson of the first Vongola boss, who had  moved to Japan from Italy during his time. He is told by Reborn that he  will become the tenth (
Italian decimo)  Vongola boss. Also, the other candidates for the position of the head  of the Vongola Family have died. For these reasons, Tsuna is the only  remaining 
heir.  As such, Timoteo a.k.a. "Vongola IX", the current head of the family,  sends Reborn, an infant hitman from Italy, to train Tsuna. Tsuna then  unwillingly undergoes training from Reborn. Reborn's main method of  teaching Tsuna is the "Dying Will Bullet", which will make the person be  "reborn" with a stronger self intent on fulfilling his dying will.  Through his experiences, the initially clumsy and underachieving Tsuna  unconsciously becomes stronger and more confident, which ultimately  makes him better suited as the Vongola Family's boss despite continuing  to reject his Mafia inheritance. He also starts making several  friendships such as his crush 
Kyoko Sasagawa.
Tsuna goes through many predicaments in his progress of becoming the Vongola boss including fighting against escaped 
Mafia convicts posing as Kokuyo Junior High students. Later, The Varia, Vongola assassin squad, claim the right for their boss, 
Xanxus  to be the true Vongola boss, and start a competition to decide it. To  defeat the Varia, Reborn recruits most of Tsuna's schoolmates to become  the Vongola guardians: 
Hayato Gokudera, a dynamite expert who wishes to be his 
right-hand man, 
Takeshi Yamamoto, a baseball player who thinks the Mafia is a game, 
Ryohei Sasagawa, the energetic captain of the school boxing club, and 
Kyoya Hibari, the deadly head prefect. 
Lambo, a weak infant assassin who came to kill Reborn, and 
Chrome Dokuro, a girl who has a mental and physical link with the criminal 
Mukuro Rokudo,  joins them as well. Later, after defeating the Varia, Tsuna and his  friends are transported to the future where they must face the  Millefiore Family, who are annihilating the Vongola. They also find that  all the Archobaleno are dead except for Reborn from the past. As Tsuna  and the Vongola Guardians from his time fight the Millefiore they learn  that Shoichi Irie, a comrade of Tsuna's future self, was the one who  sent them to the future as the future Tsuna said they were the only ones  who can defeat the Millefiore leader Byakuran. It is later revealed  that Byakuran has gained knowledge from parallel worlds and that he  wants to obtain all the Mafia rings in order to obtain a power similar  to 
omniscience.
After defeating Byakuran, Tsuna and company return to the present  where they learn that Tsuna is to undergo the inheritance ceremony to  officially become the 10th boss of the Vongola Family. However, the  ceremony is attacked by the Shimon Family, who have sworn revenge on  Vongola Primo for supposedly betraying the first Shimon boss. Using the  power of the Shimon rings, they have destroyed the Vongola Rings, left  Yamamoto hospitalised and kidnapped Chrome. However, a man named Talbot  reconstructs the Vongola Rings into the Vongola Gear, and Tsuna and the  remaining guardians go to Shimon's hideout where they must face the  Shimon family in battles with their pride on the line. In addition,  whoever loses in either side will be taken away by Vindice into prison  forever. While the various battles take place it is revealed that Daemon  Spade, a member of the first generation Vongola boss's family, is the  one who kidnapped Chrome and has a dark agenda in the battle between  these rival families.
Manga
Written and drawn by 
Akira Amano, the 
Reborn! manga has been serialized in Japan's 
Weekly Shōnen Jump Volume 26 since May 31, 2004 and it is still ongoing.
 The individual chapters are also published in 
collected volumes by 
Shueisha, with the first volume having been released on October 4, 2004,
 and as of April 30, 2010, twenty-nine volumes have been released.
 The series has been licensed for an 
English language release in North America by 
Viz Media. Viz serializes the chapters in their monthly manga anthology 
Shōnen Jump Advanced and has also released them in volumes. The first volume was released on October 3, 2006
; the sixteenth volume was released on July 6, 2010.
 Reborn! is also licensed in German by 
Tokyopop,
 and in French by 
Glénat.
An official character book titled 
Katekyō Hitman Reborn! Official Character Book Vongola 77  was released on October 4, 2007 in Japan. It is based on the manga and  covers the 77 incidents that happened since Reborn arrived at the Sawada  household. The book also reveals profiles of major characters including  birthdays and favorites. Short side stories not shown in the manga are  also included, along with free color posters drawn by Amano.
 On April 2, 2010, it was released the series' first artbook titled 
Reborn Colore!
 Anime 
The series has been adapted into an anime series that lasts 203 episodes, and is produced by 
Artland and directed by Kenichi Imaizumi. It first aired on October 7, 2006 on the Japanese network 
TV Tokyo and ended on September 25, 2010.
 Though the anime series has not been licensed for distribution outside of Japan, 
Funimation, on behalf of Japan's d-rights production company, exercised a 
power of attorney to remove 
fansubbed episodes of the 
Reborn! anime from the internet. Thus, to prevent 
copyright infringement, 
cease and desist notices were sent to fansub groups who were 
subtitling the series.
 On March 21, 2009, the anime-streaming website 
Crunchyroll  began streaming subtitled episodes of the Japanese series in North  America. New episodes are available within an hour after its airing in  Japan.
As of May 29, 2009, a total of twenty-seven 
DVD volumes have been released in Japan by 
Marvelous Entertainment.
  The DVDs have secondary volume titles: the first eight volumes are  "Bullets" which contains the first thirty-three episodes; the next eight  are "Battles", and contains episodes 34 to 65; volumes seventeen and  eighteen are "Daily Chapters", containing episodes 66 to 73; the next  seven are the "Burn" volumes and contains episodes 74 to 101; and  starting from volume 26, they are referred to as the "X.Burn" volumes.
 A DVD box containing the Bullet episodes was published in Japan on June 17, 2009.