Matsushita Tadashi is a second year student at Kangokou High School (in Osaka, Japan) and a constant target of Kangokou's numerous bullies who beat him up routinely after school. He is accompanied by his best friend Saitou Takaki, who is also constantly harassed. 
As the pair grow increasingly tired of being victimized they decide to join the titular Karate Club, which is notorious throughout Osaka's youth gangs for training and producing the city's most hardened and toughest teenage thugs while maintaining the facade of a legit school sports club. But when they join the club, they find themselves picked on just as much if not worse by the club's current members.

Osu!! Karate Bu takes place at Kansai Fifth Technical High School, a school known for its delinquents, even for Osaka. Its karate club is known widely as the toughest thugs of all. First-year Matsushita Tadashi joins the karate club to stop people from picking on him, but ends up with more than he bargained for. The series soon focuses on the captain, Takagi Yoshiyuki, the strongest gangster in Osaka, and his struggle to protect the karate club and protect the city of Osaka.
 
(Source: AniDB)

Osaka Tsutenkaku University is a prestigious PR70 school. Yoshinari Takagi, the captain of the Mahjong Club, a unique institution at the school, puts his entire intellect, strength, luck, spirit, and guts into the game of mahjong in this drama full of soul!
 
(Source: Kindai Mahjong, translated)

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