Arlus is a young boy scorned and cast out by society. Emilia, a girl in the same circumstances as him, had entrusted him with a ring and a promise.

One day, he encountered a gigantic doll in the shape of a girl named Sophia, who desired to return home, just like Emilia. When Arlus found hope in this shared desire, this "girl" was brought back to life once more. And so, the journey to bring salvation to this cursed connection now begins.