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The usage of Japanese slang
I find GTO to have a deeper meaning under the manga after reading a few more volumes. It is about a teacher who is hated because people don't see him as a teacher. There is some nudity and harassment of characters including suicide if that turns you down. I think it is labeled as 少年 manga, but I definitely feel it is a 青年 manga. There is 振り仮名 on every kanji, I think. But the book is full of slang including some dialects.
I think you can learn some good Japanese from this because people talk how they would talk in real life rather than just jlpt Japanese.