Super OVA 1: Based on a story from vol. 27 of the manga, Shampoo and Ukyo arrange to travel to a cave that is legendary for breaking up couples. They hope they will cause Ranma and Akane to break-up and Shampoo hopes to ditch Mousse the same way. 
Super OVA 2: "Jaaku no Oni" (lit. "The Wicked Demon") was released in 1995. Based on a story from vol. 29 of the manga, an Oni (that wears a tiger-striped diaper just like the Oni of Urusei Yatsura) escapes it`s sealed box and begins to possess people in the neighborhood. 
Super OVA 3: This is a story from vol. 31. Ranma disturbs a doll that takes revenge on anyone that shows it disrespect. In order to teach Ranma a lesson, the doll possesses Akane and tries on many occasions to attack him. 
(Source: AniDB)

Kuno purchases a strange egg, believing that the mysterious powers of the legendary Phoenix will help him defeat Ranma. But when the egg hatches on his head, the bird goes out of control and wreaks havoc all over Tokyo. Ranma and the gang must use any means necessary to get the Phoenix to leave Kuno's head and fly away.
 
(Source: Anime News Network)

Twelve years after the final OVA was shown, and the end of the manga, a new piece of Ranma &frac12; animation was made for the "It's a Rumic World" exhibition of Rumiko Takahashi's artwork. The new 30 minute special is based on the "Nightmare! Incense of Spring Sleep" manga story from volume 34, and was shown on odd numbered days at the "It's A Rumic World" exhibition in Tokyo from July 30th to August 11th. 
(Source: Wikipedia)

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