The daughter of Japanese Foreign Relations Ambassador Akari Hiroshida attends a college of deduction with her friend Chester. During her training to be a detective, Akari Makoto has been kidnapped by nine different groups of people. She's been rescued every time by the town's heroes, Ronin and Crossfire.
But when she's given a case that seems impossible to crack and a Japanese transfer student named Tadashi enters her life seemingly solely to torment her, Makoto's low grades seem unsalvageable.
This becomes the least of her problems, of course, when Chester is mysteriously injured, Tadashi keeps following her, and she stumbles into one of the most dangerous treasure hunts in history.