It's not Desperately Seeking Ranma, but it turns out PixelWriter1 posted a not so short (42K words) story back on 10/31 titled A Day of Boredom in which boredom sets in during summer break when nearly all Ranma's antagonists go on vacation resulting in an unusually long period of peace (or at least a lack of actual fights) the resulting boredom leading to his learning some new techniques.
Will the transhumanist future have catgirls? Does Japan still exist? Well, there is your answer.