A disastrous field trip leads to Ranma's class getting stranded on a deserted island, thanks to the Principal's reckless attitude. It quickly becomes apparent that the Aloha Virus, which turns someone into a honeymoon tourists, has infected all the boys of the class. Ranma, Ukyo, Akane, and Miss Hinako go after the cure that principal has, but the Principal drinks the antidote before they can get their hands on it. They then drag him to a hot spring and force him to sweat out the antidote.