Knights of Ramune

In an alternative future version of Earth two holy virgins, Cacao and Parfait along with their small blob robot comrade Piqu, are sent further into the future to find the fourth Ramunes warrior. The girls find someone claiming to be the fourth Warrior, but he's actually the commander of an invading force. They escape his space fortress in a giant mecha, along with the orphan girl, Lemon. What follows is the realization of who the fourth Warrior really is and the recovery of a large robot named the Mythical Knight that was created to destroy the galaxy.