Buy: My Only King by Lily Hoshino

Paperback editions:

In the land of magic, a new king is being crowned. However, a mishap during the ceremonial rite causes the royal crest to be accidentally attached to a normal human, Kazuomi. To protect the crest from any villains who may be after it, Mewt ― the cute and brave sorcerer ― is dispatched to the human world. There, Mewt must live disguised as a girl, and as "she" and Kazuomi live under one roof together, the two begin to find themselves attracted to each other...

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