Ariana, the second daughter of a ducal family and the vice-commander of the First Mage Corps, finds herself in a predicament when her lover, Prince Sirius, suffers from "Dragon Demon Syndrome," a disease unique to the royal family. To save him, Ariana ventured into the dangerous Dragon Valley in search of the dragon scales needed for treatment. When she returned, barely alive, with the scales, she found Sirius embracing her sister and telling her he loved her. "I couldn't save them in my first life. That's why, in this second life I got through my 'promise' with Ryu, I swore that this time I would definitely do it..." "As long as he's alive, that's all that matters," Ariana tells herself. Why did Sirius, who was supposed to be intelligent and devoted, abandon her? A sweet and bittersweet love fantasy begins, about two people who keep missing each other!