Sharpen your “deduction” and claim the “truth”! To combat a sharp rise in violent crime, "Detectives" have become essential to society. Entering the elite Japanese detective training school, Marimine Detective Academy, Fumisaki Misaki encounters a beautiful young girl named Shia E. Hazeldine, the legendary "Detective Princess," with whom Misaki shares an inescapable twist of fate. As if bound by destiny, the two soon find themselves in a fierce clash of wits, risking their very souls to uncover the "truth."