 If you liked
Shonan Junai Gumi!
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 ...then you might like
Osu!! Karate-bu
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These two shows definitely have their differences, but they also have their similarities. Both shows are short 90s OVAs and both are centered around high schoolers beating up tough guys. They also both have their fair share of silly moments as well as very serious, sometimes very tense, moments. I recommend checking out at least an episode of each and if you like them, check out the manga as well.