ISEKAI NI SHOUKAN SARETE WATASHI GA KOKUOU!? SONNA NO MURI DESU!

You are a king summoned by God. Minami Kaifu, who had been spending her days working overtime, was heading home on the last train as usual. "I want to live as elegantly as a queen..." she muttered to herself as she opened the door to her home, The next moment, I was summoned as the next king of an unknown country—!? Just when he thought she'd achieved her dream of a carefree king's life, she finds herself immersed in studying, and somehow even ends up joining the Knights' Order...? (Source: Hifumi Shobo, translated) — Description from AniList community (anilist.co).