Great Teacher Onizuka (2012)

The most shocking story ever in GTO! Onizuka is infuriated! Saving him from his abusive parents! (1x5)

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Doujima has been forcibly given a tattoo by his abusive father, and his mother has vanished. He gets a gun to kill his dad, and when Onizuka tries to help, he puts the gun to Onizuka's head.