Akitsu, which had long been in a state of diplomatic severance, decided to marry Jeremy, a member of the royal family of the great power Albion, and Yukiyo, the daughter of Akitsu's governor, for the sake of a military alliance. Jeremy is attracted to the beautiful Yukiyo at first sight, but this is a political marriage to deepen the relationship between the two countries, and he cannot be honest with Yukiyo, who is suspected of being a spy. Meanwhile, Yukiyo is expected to have the ability to seduce and manipulate men as she pleases, but she is aware that she is a failure. Jeremy's attitude is stubborn in comparison to Yukiyo's devotion, and he is troubled by his inability to fulfill his role. Tsurugi, a special envoy from Akitsu, has been Yukiyo's tutor and supervisor since she was a child, and Yukiyo is driven to the brink by his strict pressure.