In a special OVA series, Shampoo and Ukyo plan a trip to a mystical cave known for splitting up couples, aiming to create discord between Ranma and Akane while Shampoo hopes to part ways with Mousse. Another OVA, 'The Wicked Demon,' adapted from the manga's volume 29, features an Oni breaking free from its confinement, causing chaos by possessing locals. The third OVA, based on volume 31, follows Ranma's encounter with a vengeful doll seeking retribution for disrespect, eventually taking control of Akane to seek revenge on him.