Isekai ni Shoukansarete Watashi ga Kokuou!? - Sonna no Muri desu!

From Google Translate:

You are a king summoned by the divine...

Minami Kaibe, who spent her days buried in overtime work, was heading home on the last train as usual. Muttering, "I wish I could live a life of luxury, like a king..." she opened her front door—only to find herself instantly summoned to an unfamiliar land as its next monarch! She thought she had secured the carefree royal life of her dreams, but instead, she found herself facing endless study sessions and—for some reason—even enlisting in the Order of Knights...?