Aria saves Kinji, but she senses his hidden potential. She "claims" him as her partner, much to his annoyance. As the two begin working cases together, they realize the Butei Killer is part of a much larger organization called .
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. Hidan no Aria (Dub)
A descendant of Arsène Lupin who uses disguises and traps to manipulate Kinji. Aria saves Kinji, but she senses his hidden potential
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. Everything changes during a routine commute
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.
Kinji’s childhood friend and a sword-wielding shrine maiden who is fiercely protective (and jealous) of him.