Elves are known to be a romantic and loyal race with longevity. They commit to one partner for life, until death does them apart. If their partner passes away, they feel as if their heart has been taken away by fate.

It is hard for elves who have lost their partner to heal their sorrowful and lonely hearts; at the end, most of them took their own lives away to be with their beloved. This applies to the melancholy and gloomy King Soleil von Astral; he is on the verge of taking his own life away.

His beloved, Queen Asteria, died at the hands of human war, leaving him filled with hatred towards the race that took her away from him. He sealed off his beautiful elven kingdom away so none may enter or leave; he made a vow that no humans shall enter the kingdom in honour of his beloved Queen.

500 years have passed, the Elven Kingdom of Astral is still sealed, and the one courageous and charismatic king has turned the kingdom melancholy as the passing of his beloved has not lifted away. His melancholic rule affects his people; the elves aren’t as cheerful as they were 500 years ago.

The economics of his kingdom slowly deteriorate, and the king’s council is worried for their kingdom and people. They propose the idea that they will find a bride to fill the king’s empty heart for the sake of their kingdom. It may not be easy, but it is necessary to be executed. Sapphire, a 23-year-old maiden, is working as a delivery woman in the neighboring country.

As she was working as she usually does, she found an injured elf. He gave her a letter and told her to deliver it in the Kingdom of Astral as the letter was a very important notice from the Umbra Empire before succumbing to his injuries. Sapphire silently wonders how she will deliver the letter into the sealed kingdom for 500 years.