Dual! Parallel Lun-Lun Monogatari
English title: Dual! Parallel Trouble Adventure
Japanese title: デュアル！ぱられルンルン物語
Alternative titles: Dual! Parare Runrun Monogatari, Dual Parallel! Trouble Adventures
Type: TV
Source: Original
Episodes: 13
Status: Finished Airing
Aired: Apr 8, 1999 to Jul 1, 1999
Broadcast: Thursdays at 19:00 (JST)
Duration: 25 min per ep
Rating: PG-13 - Teens 13 or older
Studios: AIC
Producers: Pioneer LDC
Licensors: Discotek Media, Geneon Entertainment USA
Genres: Action, Comedy, Sci-Fi
Themes: Harem, Isekai, Mecha

Kazuki Yotsuga is your regular average nerd in high-school, except he isn't smart. He has this website which relates to his visions that only he can see. His visions are about robots who keep fighting each other battle after battle. One day he is sent to a "parallel world" where these visions exist and he joins a company to fight back against the devious RaRa, who want to take over the world. 

(Source: ANN)