Dokaben is a baseball manga by Shinji Mizushima, serialized in Weekly Sh&#333;nen Champion magazine from April 24, 1972 to March 27, 1981. It was later made into an anime by the same name. It was immensely popular in Japan during its original release, and in sports manga of all time it likely ranks second only to Slam Dunk by Takehiko Inoue. 
A dokaben is a kind of bento box which the protagonist, Taro Yamada, likes to eat. 
(Source: Wikipedia)

Taro "Dokaben" Yamada, who was a judoist while at junior high, enters Meikun High School and is talked into joining the baseball club. He displays his superb athletic abilities in baseball and becomes well-known as a hard hitter. He and his unique teammates establish Meikun a solid position as No.1 in the High School Baseball Championship games. 
(Source: nipponanimation.com)

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