Of the two, Lamune DX is the real standout series, probably the pinnacle of the whole franchise. The basis story is a ripoff of Sailor Moon, which was also at its popularity peak at the time. Lamune and Da Cider head off to Puff-Puff Palace to rescue two beautiful barely clothed maidens, Gold Mountain and Silver Mountain- the Mountain Duo (get it?) This of course infuriates Milk and Leska, who with a rather confused and unwilling Cocoa transform into the Seinaru Senshi (A pun on "Sailor Senshi" from Sailor Moon) "Seinaru Milky","Seinaru Cacao", and "Seinaru Lemon". The three then head after their would-be boyfriends to extract their revenge.

Source: doki-doki.net

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Prequel: NG Knight Ramune & 40 EX: Biku Biku Triangle Ai no Arashi Daisakusen
Sequel: VS Knight Ramune & 40 Fire