Demon*******

Xia Lenge's only older brother, who studied at Rose Empire College, had not been heard from since two years ago due to a sensational case of missing students. In order to find his brother's obsession, Xia Yanran was admitted to the world's largest aristocratic college in New England. When arriving at the academy on the school's luxury cruise ship, Xia Lenge fell into the water and asked for help from Kanata Lansat, known as the Crown Prince (Tzarevich). Unable to help herself, Xia Liange became a "knight" at the mercy of Kanata! At the same time, the Black Knight Alliance, an underground organization in the academy that specifically fights against the academy's regulations, seemed to be ready to take action, and strange things began to happen one after another.