"Ranma ½: Nightmare! Incense of Spring Sleep" is an OVA (original video animation) that expands on the comedic and fantastical elements of the "Ranma ½" series. The story revolves around Ranma Saotome, a martial artist cursed to transform into a girl when splashed with cold water, and his fiancée Akane Tendo. The narrative begins when Ranma and Akane encounter a mysterious old woman selling incense. Unbeknownst to them, the incense induces vivid, surreal dreams that blur the line between reality and fantasy.

The central conflict arises when Ranma accidentally purchases the incense, leading to a series of bizarre and humorous dream sequences. These dreams are influenced by the subconscious fears and desires of the characters, creating chaotic and exaggerated scenarios. Ranma’s dream, for instance, involves being pursued by a giant version of Akane, while Akane’s dream features a distorted version of Ranma as a domineering figure. The dreams escalate in absurdity, with other characters, including Ryoga Hibiki, Shampoo, and Mousse, also becoming entangled in the dream world.

As the characters struggle to distinguish between their dreams and reality, the old woman reveals herself to be a dream demon who feeds on the chaos caused by the incense. The story culminates in a confrontation where Ranma and Akane must work together to overcome the dream demon’s influence and break free from the nightmare. The resolution emphasizes their growing bond and mutual reliance, even as the comedic tone remains intact.

The OVA retains the signature humor, slapstick, and gender-bending themes of the main series while exploring the characters’ subconscious minds in a more surreal and imaginative context. The dream sequences provide opportunities for exaggerated character interactions and visual gags, staying true to the series’ comedic roots. The narrative structure, while episodic, ties together through the overarching conflict with the dream demon, offering a self-contained story that complements the larger "Ranma ½" universe.