A young boy scorned and cast out by society ・ Arlus. A girl left in the same circumstances as him ・ Emilia, who had entrusted him with just a ring and a promise he made with her. One day, he encountered a gigantic doll in the shape of a girl ・ Sophia, and her voice reached him with the wish to return to her home, something she shared with 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.

Translated from the official description found here: https://magcomi.com/episode/13933686331613420458