Dual! Parallel Trouble Adventure (デュアル!ぱられルンルン物語, Dyuaru! Parare Runrun Monogatari) is a Japanese anime series animated by AIC and created by Masaki Kajishima, best known for the Tenchi Muyo! franchise. It was originally broadcast on Wowow from April to July 1999 and was licensed in the US by Pioneer LDC, later known as Geneon. In addition to the original TV run, an OVA special was added to conclude the series as a de facto "14th episode".
The title refers to the fact that the story takes place in two parallel universes, a concept loosely based on multiverse theory.