If you liked
Shamo
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...then you might like
Rainbow: Nisha Rokubou no Shichinin
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Both mangas begin in a juvenile prison with plenty of cruelty. While Rainbow is about camaraderie and surviving with the help of friends, Shamo is the opposite, with Ryo pushing everyone out of his way, trusting only martial arts and himself to survive. Shamo is a more realistic and nihilistic take on how juvenile prison and abuse affect a young man, while Rainbow paints an idealistic picture of how despite the hardships you can achieve happiness. Rainbow's characters are strictly good or bad, while Shamo makes you doubt if Ryo even is the good guy, to the point that you even despise him at times. Shamo is definitely the crueler of the two.
If you liked
Basilisk: Kouga Ninpou Chou
|
...then you might like
Fuuma no Kojirou: Yasha-hen
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Fuuma no Kojirou has a very similar setting to Basilisk, only these ninja are high school students. I don't know why they are, because they hardly ever go to school. - two battling ninja clans - many characters with special techniques - duels to death The drawing style and animation quality differs though, but it's an old anime, so no wonder.