In a Japanese school, 5 adolescent geeks join the new sport teacher and take up the challenge to take part in the synchronised swimming competition, in-spite of the mockeries of the real sportsmen.

It's three years after the events of the original Battle Royale, and Shuya Nanahara is now an internationally-known terrorist determined to bring down the government. His terrorist group, Wild Seven, stages an attack that levels several buildings in Tokyo on Christmas Day, killing 8000 people. In order for the government to study the benefits of "teamwork", the new students work in pairs, with their collars electronically linked so that if one of them is killed, the other dies as well. They must kill Nanahara in three days - or die.

When good-natured Mayumi finds herself at the mercy of her sadistic, panty-crazed teachers, only one brave naked soul is capable of confronting her tormentors -- Kekko Kamen! Wearing nothing but knee-high red boots and a red leather mask, this nunchaku wielding superhero gives these perverts a dose of their own medicine. Wildly cornball and completely over the top, this will have you watching with mouth agape in utter disbelief! Two Nipples Up!