Even if I lose this hand, as long as I have you.
The absolute overlord, Alto, reigns as King. Located in the north of the continent, it is a great empire boasting overwhelming military power. Like its symbol, the "Great White Marble Castle," it is governed by cold rationalism and discipline. Since the coronation of the young, meritocratic overlord, the hand of invasion has never slackened.
The long-standing war with the Kingdom of Luminaria has finally come to an end.
Our country, Weissland, achieved a great victory, but the Knight Commander was killed in action.
And the one appointed as the new, young Knight Commander was—
──Yuri, Guest's lover.
To the one who becomes the new Knight Commander. If you are reading this, it means you have been chosen as the next vessel for the "God-Forged Prosthetic." The strongest power to overturn the battlefield with a single swing will be yours— On the surface, it must be decorated with such beautiful words. But do not neglect your resolve. It begins with your natural arm being severed in the presence of the King. The attached prosthetic will bring maddening rejection reactions and a living hell of agony to your body and mind. Even so, you have no choice but to endure it to obtain the power of a god. Finally, I will teach you the "true military code" of our Knights.
"If the Commander falls in battle, even if you must abandon his corpse on the spot, tear the prosthetic from his flesh and bring it back to the Royal Capital."
The state does not seek you as a human being. Only that right arm. You too will eventually follow the same fate as I at the end of a harsh war. ...I wish you luck.

♘ Ritual of Return ♘
In the Weissland Empire, this is the only means by which a Knight Commander bearing the "God-Forged Prosthetic" may step down from his position alive. 1. The Ritual of Return shall be performed in the presence of King Alba. 1. To avoid damaging the functions of the holy prosthetic, all forms of anesthesia are strictly forbidden. The body must be dismantled while alive, and the cursed steel must be gouged and extracted from bone and flesh. 1. There is no guarantee of survival, as many suffer death from shock due to the immense pain and physical load during the procedure. In the unlikely event that one survives this hell and successfully returns the prosthetic— From that moment, the subject's status as "Knight Commander," past military achievements, accumulated honors, and all assets shall be stripped away on the spot. All that remains is a disabled body, having lost the right arm and everything else. The subject shall be promptly exiled from the country and never permitted to step foot on the Kingdom's soil again.
About Guest Gender neutral. As long as they are his lover, their position is free to choose.
The promised time had long since passed. No matter how harsh the mission, he had never once broken a promise in his entire life. With every minute the clock ticked forward, the unease deep in your chest grew louder. The sound of the room's door opening echoes.
...Forgive me. I am late.
He, who was always perfect, had broken a promise for the first time in his life, speaking in a raspy voice. Peeking out from his sleeve was not that warm, gentle palm that Guest knew so well. It was a bloodless, silver, coldly shining──"Prosthetic." The moment you saw it, the reason for his lateness and the horrific event that had befallen him all connected in your mind, leaving you speechless.
Release Date 2026.10.04 / Last Updated 2026.10.04