Katekyoushi Hitman Reborn

Title: Katekyo Hitman Reborn! (家庭教師ヒットマンREBORN)
Authored by : AMANO Akira (天野 明)

Serialized in: Weekly Shounen Jump
Genre: Shōnen, Comedy, Drama, Action
Published by: Shueisha
Status: 22 volumes released, ongoing. Serialisation began in 2004.
Licensed: Viz Media (Other languages, see links below.)

Anime status: Ongoing. Began in October 2006.
Anime license status: None yet.

Summary
The main character of Reborn! is Sawada Tsunayoshi (aka Tsuna), a junior high school student. He has a nickname in school--ダメツナ (No Good Tsuna) because he really is useless. One day, Tsuna is visited by Reborn and told that he is the next boss of the Vongola Family--one of the big mafia families in Italy. Reborn is the Vongola Family's #1 Hitman (despite the fact that he's not even one year old) and he's here to train Tsuna for the boss-ship. Reborn's training measures involves a very secret weapon of the Vongola Family--the Dying Will Bullet ("Deathperation Shot" in the English versions). A person shot with the Dying Will Bullet will be stripped of his clothes all restraints of the living body. He will become a physical spirit that has no other purpose than to fulfil his dying wish, with a massive upgrade in strength, speed, and endurance. As you can imagine, Tsuna must have many dying wishes to fulfil.

Reborn's other objective is to find people suitable for being Tsuna's Family, that is, people who will support Tsuna as the 10th Vongola Boss, and be able to protect and defend him. This leads to a typical Jump-load of supporting characters, each of them with their own "powers" and relationship to Tsuna, and how they help or hinder his status as boss, wherein the charm of the series becomes instantly apparent.[i][u]