Urusei Yatsura: The Shougaibutsu Suieitaikai
Japanese title: ザ障害物水泳大会
Type: Special
Episodes: 1
Source: Manga
Genres: Action, Comedy, Romance, Sci-Fi
Studios: Sunrise
Producers: Atelier Musa
Duration: 27 min
Rating: PG-13 - Teens 13 or older

On a very hot summer day in Tomobiki town, Lum, Ataru, and the rest of the gang are looking forward to using the school's pool. But the teachers have other plans: setting a ludicrous obstacle course between the students in their swimsuits and the pool... naturally this ends in complete chaos.

(Source: AniDB)