Satonaka Ikko is an apprentice Buddhist priest. He is sent to Saien Temple whose chief priest is his grand mother, Jotoku. What waiting for him there are severe training, purification jobs, and 6 nuns. The situation living with nuns of the same ages sounds enviable, but actually he is treated as an errand boy, and his purification skill cannot compare with theirs. However, when he has worldly desire, his power becomes stronger than anybody.

Set in a slightly futuristic world where Earth has been invaded and is at war with aliens from another dimension called the Nova, the story follows the adventures of a Japanese boy named Kazuya Aoi who enrolls for training at a special school for genetically modified girls called Pandoras who battle the aliens, and their male partners, called Limiters, who use a special power called "freezing" to limit their opponent's mobility. The protagonist makes the acquaintance of an unusual older girl named Bridgette L. Satellizer who appears to be the most powerful Pandora in her class, but has not yet chosen a male partner to be her Limiter, and in spite of the warnings of all his friends, he decides to be her Limiter.