[Machine Translation] This is the story of a boy called Arthur, before the birth of the great detective Sherlock Holmes. When young Arthur Conan Doyle entered Baskerville Hall, a school for gifted children, his heart was filled with joy and anticipation. It was the perfect stage for him to prove himself. But what awaited him there was a daring girl, Irene Eagle, and a boy, Jimmy Moriarty, who had a mind to match Arthur's. They discovered that their new school was not just a school, but a strange place with amazing creatures, unexplainable explosions, and enemies lurking in the darkness. They discover that this new school is not just any school, but a strange place with amazing creatures, unexplainable explosions, and enemies lurking in the darkness. After discovering the school's oddities, they are invited to join a secret society called the "Clover Alliance," which requires them to complete three difficult trials in order to become a member. Arthur unravels a mystery that will lead him on an epic adventure, but he will also discover that there is even greater danger ahead.