Boukun Ou no Hatsukoi

Sakurako, in the midst of her unhappiness after her engagement was broken off, happened to come across a book of happiness. A naked man jumps out from the book--? He is Nero Theosius, a tyrant and feared king with a handsome and well-trained body. Cursed by a witch, he cannot return to his original world until he knows "true love."

This is a story about a tyrannical king who wants to know true love and a woman who does not believe in love.