GTO. Cool Teacher Onizuka. Book 4

Onizuka's enemies won't give up: he's被set up and accused of embezzling money for summer school. Onizuka agrees to return the entire amount and recklessly promises as an apology to take the kids to Okinawa. But this requires even more money, and our hero doesn't have a penny to his name... However, he has loyal friends who won't leave him in trouble: class 3-4. All this time Onizuka has stood up for his students - now it's their turn to save the teacher. However, the task facing the schoolchildren is no easy feat: they have to earn eight million yen in just a few days!