A dystopian young adult novel about a place called Elysium where people dreamed of living. However, they need to undergo a purification process before being allowed to move there. Once in Elysium, the citizens aren't allowed to go back to their hometown. The truth is only revealed when Fermaryllis II ran into an Elysian.

Japan was in a state of change after the arrival of Commodore Perry. Thus the capital went through changes that westernized Japan. Reiko was bred in Tokyo, formerly known as Edo. Her mother, on the other hand, lives in a remote village in the Aiko district. Because of a misunderstanding, Reiko found herself immersed in her mother's world and her mother lost in her daughter's. What will they discover in these two different worlds, both of them lost in a world different from their own?