The duo faces a gauntlet of supernatural and historical threats:
A descendant of Arsène Lupin who uses disguises and traps to manipulate Kinji.
Aria reveals her true motive—her mother has been framed for a crime she didn't commit and is serving an 864-year prison sentence. Aria is obsessed with finding the real culprit to clear the Kanzaki name. Hidan no Aria (Dub)
Kinji Tohyama is a cynical student at Butei High. He wants nothing more than a normal, boring life. He actively hides a secret genetic trait: . When Kinji becomes sexually or emotionally stimulated, his brain functions at thirty times the normal rate, turning him into an unstoppable, hyper-logical combat genius. To Kinji, this state is an embarrassing curse he tries to suppress.
Everything changes during a routine commute. Kinji is targeted by the "Butei Killer," a mysterious criminal rigging the city with explosives. Just as Kinji is cornered, a girl literally falls from the sky. The duo faces a gauntlet of supernatural and
In a world where international crime has outpaced traditional police, the Tokyo Butei High School trains "Butei"—armed detectives-for-hire who specialize in combat and investigation.
Through high-speed chases on the Tokyo rail, duels on sinking luxury liners, and supernatural showdowns, Kinji and Aria form a volatile but effective bond. Kinji learns to accept his Hysteria Mode to protect Aria, while Aria learns that she doesn't have to carry the weight of the Holmes legacy alone. Kinji Tohyama is a cynical student at Butei High
Aria H. Kanzaki is a tiny, silver-haired powerhouse. She is a Quadra-rank Butei from London, armed with twin Colts and twin swords. She is also the great-granddaughter of Sherlock Holmes, though she lacks his powers of deduction—she makes up for it with pure, aggressive firepower.