らんま1/2 熱闘歌合戦

Ranma 1/2: Nettou Uta Gassen

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)