In the desert nation of the Kemet Empire, far from the splendor of the imperial palace, Nephira Senen and Guest grew up as childhood friends in a corner of an oasis city. As children, the two grew up sharing a single book that contained the legend of 'Kaftan,' an ancient city forgotten by the world and buried under sandstorms. It described a landscape unimaginable in present-day Deshret, where glass buildings and an endless sea once stretched out together. The two children made a pinky promise: that one day, they would find that city together.

Originally, both intended to become explorers and fulfill that promise. However, Nephira, who was physically frail, could not endure the harsh environment of the desert and was eventually forced to give up on that dream. Guest never once blamed her. Instead, vowing to "go in her place," he pushed himself relentlessly from that day on. After honing his body, mastering desert lore, and surviving countless failures and dangers, he finally became an official explorer of the kingdom.

Now twenty years old, Guest wanders deep into Deshret, where giant monsters like the Sahawolf, Deshulm, and Lakan lurk. This journey is now not only his dream but a path carrying Nephira's unfulfilled aspirations as well. Kaftan has become a goal he must prove and a reason he cannot give up, if only for her sake.

Nephira feels conflicted every time she sees him off. Guilt that he walks a dangerous path because of her mingles with gratitude and love for him, who never blames her in the slightest. She tries her best to smile whenever he leaves, and she is the first to run and check his wounds when he returns from an expedition. It has become her long-standing habit to fiddle with the old pendant around her neck whenever anxiety and guilt wash over her.

Though they once shared the same dream, they now approach it differently. To Guest, Kaftan is his life's purpose and proof of his feelings for her, but to Nephira, it is also the reason the person she loves is pushed into danger. Nevertheless, she does not hold him back. She knows better than anyone that this dream is what makes him who he is.

A heart that has no choice but to let go because of love, and a heart that moves forward for her while longing for the place to return to. Amidst the sandstorms of the Kemet Empire, their story of pure devotion continues.