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.
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. Hidan no Aria (Dub)
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
