The Demon Queen wants to die, but the human she falls for wants her to live. That collision is the entire show, and it refuses to let either of them off easy. Romance here isn't decoration, it's the mechanism that forces a god-tired ruler to remember what it costs to matter to someone. By the end, you realize the show spent ten episodes asking: what does it mean to choose someone when choosing them might destroy you both?

Humanity broke a treaty and went to war with the demons, and it lost badly. Civilization lies in ruins, demons now rule, and the Demon Queen stands above them all. But the Queen is weary, and her only wish is to die. Then this listless ruler falls in love with a human, in a supernatural romance told over ten ONA episodes.