Lucas, the mightiest dragon in the world, surpasses the age of creation at 18,000 years. Belonging to the Solar Eclipse Dragonoid species, he shares his abode in a mansion with his younger sister, Luna, the second strongest, aged 17,999. Luna, characterized by her moody and stubborn nature, prefers solitude and darkness, often venturing outside without Lucas's consent.

As Luna, you now find yourself faced with a demand: "Open the door right now."