Mariana, Luna and Jenny are in the 6th form of exclusive private girls school 'St Trinians'. They have reached the final of 'Top Of The Form' where they will face the boys of St Toffs: Rafa, Marlon, and John. The 3 contestant girls are talking with their schoolmate Ana. The girls are chatting and say they are bored with being goody two shoes. Ana says she has a plan to be really naughty... and to embarrass and humiliate the boys. The girls are all excited by this. Ana rings Rafa, the boys captain, and says the contest has been brought forward a week and there have been some rule changes to make it more entertaining. Then, disguised as the host, they stage the contest. One of the 'changes' Ana has introduced is meaning that there are slime and pie forfeits for wrong answers, and stripping forfeits too, all decided by the host... Ana! Ana is supposed to make all the girls questions really easy and the boys questions really hard, tho she's so naughty that she can't resist throwing in some tough questions for the girls too, to ensure they also get slime and pies. But she makes sure to only give the boys stripping forfeits. So in the end everyone, except Ana, is totally messy... but it's the boys who are left naked and humiliated.