Children's book According to my butler Kadokawa Tsubasa Library

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Children's Book
Kadokawa Tsubasa Bunko / Released as a live-action movie in May 2019! Mystery of the upper class of the master and steward combination! Hanakai, the new family head of the Karasumaru family, is still 18 years old. She returned home from her study abroad believing that she could spend time with her trusted steward, Otori, but for some reason, it was a strange young man named Koi no tsuki who welcomed Hanakai. A young family head, a new steward, and a reluctant combination were born!