A two-part music OVA series never released outside of Japan featuring the main Ranma 1/2 characters. They appear to be having a music contest at a local TV station. As everybody knows, these characters can't get along for more than three minutes and hilarity and hijinks ensue. 
(Source: AniDB)

Ranma Saotome, the boy who turns into a girl with a splash of water, always has his hands full fending off crazed admirers. One of the most fanatical is Shampoo, a girl from a tribe of Chinese Amazons who tried to kill girl Ranma, was defeated by boy Ranma, and then proposes marriage to him due to her clan's rule. Things get a little crazier when Shampoo falls into a cursed spring and turns into a cat! And even crazier when Mousse, who is in love with Shampoo, challenges Ranma to a battle over... Ranma's fiancee, Akane...? 
 
(Source: Viz Media) 
 
Note: Episodes 7-9 were originally meant to be seen between episodes 13 and 14 of the original series.

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