Ring ni Kakero (Japanese: リングにかけろ, Hepburn: Ringu ni Kakero, lit. "Put It All in the Ring") is a Japanese manga series written and illustrated by Masami Kurumada. It was published in Weekly Shōnen Jump between January 1977 and October 1981. The individual chapters were compiled by Shueisha into twenty-five tankōbon volumes. A sequel entitled Ring ni Kakero 2 was serialized in Super Jump between 2000 and 2008.

An anime adaptation produced by Toei Animation premiered in October 2004. It was followed by a second season premiered in April 2006, a third season in April 2010 and a fourth season in April 2011.

Ring ni Kakero is one of Weekly Shōnen Jump's best-selling manga series, with over 13 million copies sold.

The story centers around the life of a young boxer named Ryuuji Takane and his sister Kiku, who is his coach. Ryuuji and his sister both inherited their father's talent for boxing with Ryuuji inheriting his strength and techniques while Kiku picked up his talent for analysis and strategy. In the past, their father was a famous boxer. Ryuuji and Kiku went away from home to train and become famous in order to help their lonely mother. On the way to stardom, they have to defeat the strongest challengers all over the world.

In Ring ni Kakero 1, the characters are briefly introduced, telling the story from the moment Ryuuji and Jun Kenzaki (his eternal challenger and supposedly best friend) fight for the National Boxing Title and having both achieved stardom. Ryuuji's sister then tells the story from the beginning which starts from when Ryuuji is the finalist in a local youth championship and had to compete against Kenzaki, the latter winning after an almost tie and K.O. one-to-one fight.

Afterward, most of the series tells about Ryuuji being the successor of Kenzaki (as the latter was terribly injured and almost crippled), who competes in the Japan National Boxing Championship, where he encounters strong and deadly opponents, including Ishimatsu Katori (a comic relief, but also a strong fighter), Takeshi Kawai (who specializes in the upper jab technique; he is also a pianist and also likes to cheat) and Kazuki Shinatora (who specializes in the Rolling Thunder technique; he is a former kendo practitioner, who retired when he challenged his father due to his cruel training).

Later on, the Jr. Japan team facing Blackshaft's team was adapted into an anime. Ryuji, Jun, Katori, Kazuki, and Takeshi represented Japan. Blackshaft had no intention of taking Japan seriously in a boxing match so he recruits Mick, leader of the Great Angels New York Branch (originally the Hells Angels in the manga), a deathrow inmate Monster Jail, Missie Charnel, a mysterious androgynous boy boxing champion known for his unhealthy obsession with his own beauty that knows no bounds (even in the ring) as well as that in which he savors reducing the "pretty" faces of any opponent he faces in the ring into mush, along with hypnotic powers that he casts upon his opponents to leave them as sitting ducks for his attacks and high-speed punches and fancy footwork, and N.B. Forrest, also known as the emperor of the south and a Ku Klux Klan member (in the manga). The second season ends with The Shadow clan, formed by a boxer who used the sweet science as an assassination art, aiming after Team Japan.

Ryuuji Takane (高嶺 竜児, Takane Ryūji)

Voiced by: Masakazu Morita

The main character of the series, Ryuuji is a fierce and spirited young man who is trained in boxing techniques by his older sister Kiku. He has strong skill in basic techniques like jabs and one-twos. His special attacks include the Boomerang Hook and Boomerang Telios.

Kiku Takane (高嶺 菊, Takane Kiku)

Voiced by: Rie Tanaka

Jun Kenzaki (剣崎 順, Kenzaki Jun)

Voiced by: Ryōtarō Okiayu

Ishimatsu Katori (香取 石松, Katori Ishimatsu)

Voiced by: Takeshi Kusao

Kazuki Shinatora (志那虎 一城, Shinatora Kazuki)

Voiced by: Hideo Ishikawa

Takeshi Kawai (河井 武士, Kawai Takeshi)

Voiced by: Hiroshi Kamiya

Futaba Shinatora (志那虎 二葉, Shinatora Futaba)

Voiced by: Fumiko Inoue

Takako Kawai (河井 貴子, Kawai Takako)

Voiced by: Mami Kingetsu

Catherine (キャサリン, Kyasarin)

Voiced by: Mai Aizawa

Blackshaft (ブラックシャフト, Burakkushafuto)

Voiced by: Takehito Koyasu

Führer Skörpion (フューラー・スコルピオン, Fyūrā Skorupion)

Voiced by: Hikaru Midorikawa

Krüger Helga (クリューガー・ヘルガ, Kuryūgā Heruga)

Voiced by: Hiro Yuki

Napoléon Valois (ナポレオーン・バロア, Naporeōn Baroa)

Voiced by: Toshiyuki Morikawa

Don Juliano (ドン・ジュリアーノ, Don Juriāno)

Voiced by: Takaya Kuroda

Jun Shadow (影道 殉（シャドー・ジュン）, Shadō Jun)

Voiced by: Takahiro Sakurai

Ring ni Kakero is one of Weekly Shōnen Jump's best-selling manga series of all time, with over 13 million copies sold.^[19]