In the heart of Victorian-era London, a shadow war brews between the aristocracy and the common man, and at its center is the coldly brilliant William James Moriarty. This gripping anime reimagines the classic Sherlock Holmes lore from the perspective of the iconic villain, portraying him not as a simple criminal mastermind but as a calculating revolutionary. Driven by a tragic past that revealed the deep corruption and inequality of the British class system, Moriarty and his brothers, Albert and Louis, orchestrate elaborate schemes to topple the oppressive nobility. Using his genius for deduction and manipulation, he executes "crimes" designed to expose and punish the wicked elite, all while maintaining a facade of a respectable mathematics professor. His meticulous plans, however, draw the unwanted attention of the only man who can match his intellect: the eccentric consulting detective Soma Saito as Sherlock Holmes. The series weaves a tense, cat-and-mouse psychological thriller, exploring themes of justice, morality, and the blurred lines between hero and villain. As Moriarty and Holmes engage in a dangerous game of wits, viewers are left to question who the true patriot is in a battle for the soul of a nation.