In 'GTO: Great Teacher Onizuka: Set 1 (1998),' Eikichi Onizuka, a former biker and gang leader, becomes a high school teacher with unconventional methods to tackle the challenges of his new profession and to impart life lessons to his troubled students. This heartfelt and comical series captures Onizuka's journey as he strives to make a positive impact on his students' lives, despite his unorthodox approach.