Amelia is Korea’s only magic school, and its peaceful order shatters when seventeen-year-old Song Ah-reum, one of the school’s close-knit Five, is found dead in a blood-soaked scene. Authorities call it suicide, but her four closest friends refuse to believe it. Their search for the truth leads them to Amelia’s legendary Four Jewels—Ruby, Emerald, Sapphire, and Diamond—relics said to hold extraordinary powers. As they recover the jewels, the students uncover black magic, hidden betrayals, and secrets buried within the school since its founding. Co-written by a Korean-language teacher and twelve students, the novel blends a classic school mystery with youthful magical invention, friendship, and the determination to challenge an official story that does not add up.