Midori Takashi Kokyu No Kokahi Sono Kisaki, Choai o Kisowazu Heibon o Nozomu

Touei, the Princess of a major power, married into the small nation of Suizan, which supposedly had no harem, seeking an "ordinary" happiness. However, the Crown Prince, Seirō, had revived the harem that shouldn't have existed—!?

When she confronts him about breaking their contract, he declares his absolute devotion: "I will make you my only wife and love and protect you for my entire life!"

He has other consorts, so he can't possibly mean that... Tōei's spirit is on the verge of breaking due to Seirō's utterly cold demeanor, but she can no longer return to her homeland. This is because Tōei has a reason for wanting that "ordinary" life—.