Zero no Tsukaima ~Princesses no Rondo~ OVA is an one episode comedy, unrelated to the main story, that's there to get viewers laughing, and it certainly worked on me; I couldn't stop laughing. It was simple, generic, yet stupidly hilarious. There isn't much of a story. The principal and Saito found a chest full of bikinis (don't ask how) and decided that everybody should go to the beach for a short 2-day vacation. (girls + bikinis) x (Order of Perverts + Principal) = you know what happens. Oh, and add a giant octopus with tentacles in that equation as well. It was a great, hilarious OVA that everybodyshould watch just for the laughs. It's definitely worth 20 minutes of your time, so enjoy it!