"Waterboys" is a comedy, a very anime-esque one too, which doesn't mean a bad thing. In fact, I liked this movie for its funny moments and wacky plot elements.
The story is basically about five high school boys who decide to learn synchronized swimming, influenced by the new coach of their school's swimming team, Sakuma; An attractive young woman that is into synchro swimming. However, because of an unexpected incident, Sakuma has to go on vacation, leaving the team without supervision. With the Tadano High's summer festival coming very soon, every club from the school is preparing a special event on their own. Suzuki and friends eventually decide to organize a special sync swimming show, with the help of a dolphin trainer. Of course, this wouldn't be an interesting movie, if they didn't face some unexpected events along the way...
This is a real feel-good movie that almost everyone can enjoy. Some situations are totally hilarious, reminding me of japanese anime. The five main characters couldn't be more colourful and the acting was superb as well. Shinobu Yaguchi did an awesome job directing this movie, which is a mixture of a lot of nifty elements, from the great characters to the unbelievable humorous moments, this movie is just great.
I haven't watched Yaguchi's other works like Adrenaline Drive, for example, so I'm not sure how this one compares to them. But I'm sure if you like comedies and you're a bit open-minded, you'll like "Waterboys".