NG Knight Ramune & 40 EX: Biku Biku Triangle Ai no Arashi Daisakusen
Japanese title: NG騎士ラムネ&40EX ビクビクトライアングル愛の嵐大作戦
Alternative titles: NG Knight Ramune & 40 EX
Type: OVA
Source: Original
Episodes: 3
Status: Finished Airing
Aired: Jul 21, 1991 to Nov 21, 1991
Duration: 30 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Ashi Productions
Licensors: Discotek Media
Genres: Adventure, Comedy, Fantasy
Themes: Isekai, Mecha

Lamune has returned to Earth with no memory of his adventures on Hara-Hara world and Doki-Doki space. The remains of Gobuhriki find their way to Earth, and awaken the spirit of Don Harumage. While Cocoa builds a fighting vehicle with stuff she finds around Tokyo, Milk and Leska set off to find Lamune and Da Cider to save the day before the new Gobuhriki is revived and destroys the Earth. 

(Source: ANN)