If you happen to be a fan of "fan service", then this is your fix!

Parfait, a Holy Virgin-in training, along with her childhood friend, the more accomplished Cacao, and her training droid P.Q., are transported to a planet which is being invaded by a race of nomads called Gigo Genos. Once there, they discover that the leader of the invasion might be a prophesized hero from their own world, as well as joining up with Lemon, a plucky orphan. Can this unlikely trio save this besieged world... as well as guiding their savior from madness?

Note, the name "Ramune" is a brand name for a Japanese soft drink, noted for it's very unusual bottle, which is sealed by a large marble rather than a crown cap.