After Eikichi Onizuka was shot by former teacher Teshigara, he was sent to the hospital. Shortly afterward he escaped, and then spent 14 days that no one knew about. Strangely enough, when he returned, a wanted poster appeared with a man that resembled very much like Onizuka. What exactly did he do during these 14 days?
This manga was added as an add-in to Shounan Jun'ai Gumi and later rereleased separately. Some time later GTO came out and the two prequels became more famous.