Urusei Yatsura: The Shougaibutsu Suieitaikai
It's a Rumic World: Urusei Yatsura ／ It`s a Rumic World: Urusei Yatsura ／ Urusei Yatsura: The Obstacle Course Swim Meet ／ Urusei Yatsura: The Shōgaibutsu Suieitaikai ／ Urusei Yatsura: Za Shougaibutsu Suiei Taikai ／ うる星やつら ザ・障害物水泳大会 ／ ザ障害物水泳大会
Description
The story is from manga volume 23.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.