All Ranma ½ OVA released episodes
Shampoo changes his personality after put a pendant she found in a old jewelry collection from their grandma. The story, originally published in Ranma ½ vol. 22, features a brooch that makes Shampoo feel the opposite of her true feelings for Ranma. Ranma begins to panic at the thought of losing one of his fiancees, and plans to tell Shampoo that he loves her. Forseeing this, Cologne invites all his friends, so once he confesses, he'll be unable to back out of their engagement. This benefits Ryoga and Kuno as well, as they plan to sweep Akane away once Ranma makes his supposed feelings for Shampoo public.
Kasumi has a dream that Santa Claus asks her to hold a Christmas party at the Tendo Dojo. Practically everyone from the series is invited and chaos ensues. Ranma's fiancees become jealous of one another, Akane thinks Ranma hates her handmade present, and Ranma doesn't feel like singing kareoke with the other girls. In the end Ranma and Akane get a few moments alone, and everyone appreciates the beautiful show of shooting stars which was Kasumi's present from Santa for throwing the party.
When Kasumi falls ill and leaves the Tendo home without a chef, Nodoka Saotome, Ranma's mother, pays a visit and offers her assistance. The family isn't too happy though when she offers to help teach Akane how to cook. Akane's desire to learn to cook is even more intense, because she recently discovered her mother's old cookbook. Ranma (disguised as the Tendo's cousin Ranko) decides he should help in the kitchen in order to insure Akane doesn't accidentally kill his mother with her notoriously bad cooking.