Ranma ½, part 11 number 10

Part 19: The Waterfall of Secret Treasure Revealed! (Interesting enough there's a spelling error in the title, as they spell treasure as treausure). Herb, Mint and Lime catch up to Ranma-chan. Herb uncovers the buried treasure and water comes out, turning him back into a male.

Part 20: An ever-elusive treasure: Herb hits Ranma-chan really hard and she has to rest for a minute. Ranma-chan then bares her breasts to distract a now male Herb, but Herb is still able to hit her with a horrible strong attack.