Ranma ½ - S1E44

Rub-A-Dub-Dub! There's a Pervert in the Tub

Furious at being prevented from accompanying Akane to the hot-springs, Happosai decides to recover the scroll containing his most deadly attack - The Happofire Burst - to teach them all a lesson. Ranma is however determined to find it first, and it's a battle of wits as they both try to infiltrate the scroll's resting place - an all girls hot-spring...