Ranma fans waited twelve years for new animation, and what they got back was a perfect distillation of why the series worked: romantic chaos, physical comedy that moves fast enough to dodge your brain, a plot that exists mainly to trigger the next transformation sequence. The nightmare incense angle is pure Takahashi, a setup simple enough to explain in ten seconds that somehow generates twenty minutes of characters actively making everything worse. It's not trying to reinvent anything. It's proof the formula still works.
Happousai is back to his old tricks, raiding the girls' changing room at school for underwear. Ranma switches to his female form to catch the old lecher, though the way he goes about it shows far more than Akane cares to see. Stung by the defeat, Happousai plots revenge by cooking up a powerful Deep Sleep Incense that keeps anyone who breathes it asleep until spring is over. At the Tendo Dojo the plan misfires, and Akane gets the dose instead of Ranma. Asleep, she fiercely fends off every touch or attack and begins acting out her dreams, leaving Ranma scrambling for a cure. This single 30 minute OVA, made twelve years after the last one for the It's a Rumic World exhibition in Tokyo, adapts a volume 34 manga story with plenty of comedy and martial arts action.