The Master's Underthings
Happosai has his underwear stolen. With guest appearances from Oh, My Goddess and a cameo (sort of) from Maison Ikkoku.

Part 1
Part 2

A bit of fluff, or biting satire disguised as a bit of fluff? You decide. I just work here. I don't think my Oh My Goddess consultant ended up too happy with the story, because I pretty much shoe-horned the series' world to fit what I needed, something I'm usually not happy about when writers do it with Ranma. Hey, do as I say, not as I do.