For Y/N, an ambitious medical student, life came down to learning and coffee. Everything changes the day the sky above her college turns black and the building is turned into ruin by a powerful black dragon. At the heart of the chaos, it turns out that the people she knew aren't who they claimed to be. Her best friend, pink-haired Yuki, becomes a fearless warrior, mysterious gothic Nyx strikes with supernova power, and golden-haired Matthew draws a magic sword. Fleeing from the beast, the team is pushed by the purple-haired Diana into a mirror pane that turns out to be a portal to another world. In the dark, majestic Kingdom of Night, Y/N learns the truth: she is the last descendant of the Goddess of Night, and her dreams rule reality. Her guards were supposed to protect the secret until her 26th birthday, but the attack forced them to come forward four years too early. Now, as a 22-year-old with unstable power (manifested with silver hair and bloody eyes), Y/N must find herself in the midst of a war for the throne. Worse still, there is Iris, an enemy spy who begins to understand that true friendship is stronger than that of her master, Lord Vesperos.