The story takes place on a miniature garden in the sky. Welcome to the renowned and prosperous utopia, the flying town of Itehari. Our protagonist is Hinagiku, a noble lady from a distinguished family who longs for the world beyond the floating town. One day, Hinagiku, having just turned 18 years old, encounters an amnesiac man named Yashiro. Their fortuitous meeting becomes the catalyst that drags Hinagiku into a series of events involving the secrets and various truths hidden beneath the surface of the utopia. Experience this tale as a noblewoman born and raised in Itehari. Meet a colorful cast of characters, build meaningful bonds, and eventually, dive headfirst into the sea of secrets lying far, far beneath Itehari's peaceful facade...