HE SAID, "I CAN'T LOVE YOU" BECAUSE THE SAINT WAS COMING, SO I BECAME A FIGUREHEAD QUEEN... BUT THE SAINT WAS JUST FIVE, SO I WENT ALL-IN ON PARENTING!!

King Yuri is bound by tradition to marry the Saint, so fiancée Edeline accepts life as a mere "figurehead queen." Until the Saint appears as a scared five-year-old named Ai. Adopting the child, Yuri and Edeline forge an unexpected family whose love may become the kingdom's greatest power. (Source: MangaPlaza) — Description from AniList community (anilist.co).