The story could have been so much better if they would have made it more complex and longer.
Its kind of like great teacher onizuka, but not really. Its more about a boys school where all the guys know how to do is fight, and their teacher encourages them to in ways because she is in the yakuza (japanese gang).
Since it wasnt very long they didnt get too in detail with all the characters, nor their relationships.
The opening song is very good.
Overall... I would say that it is barely worth a watch. I wouldnt recommend it. Dont let me discourage you though, if you want to try it, go ahead.
Thats my advice.