A love story from the beautiful and ephemeral world of the mechanical floating utopia.

In Itehari, the renowned and prosperous flying city, Hinagiku longs to explore the world beyond.

One day, Hinagiku, encounters an amnesiac man named Yashiro.
Their chance meeting drags her into a series of events involving the secrets and various truths hidden beneath the surface of Itehari... for this garden city in the sky is a false utopia.