Kinji’s racing death trying to keep a bomb on his bike from blowing when a hot-headed girl with major combat skills dives in to save him and unwittingly fingers the trigger on his secret “Hysteria Mode”.

Aria tries to strong-arm Kinji into teaming up with her—by threatening to live in his room until he complies! When he fails to shake her, the two end up on a cat caper. Later, Kinji decides to investigate the transfer student’s background.

Aria shows her cute side when she follows Kinji to the arcade after school. Later, when a bus full of Butei High students is hijacked, Aria calls on Kinji to team up with her to save their classmates.

Kinji trails Aria through town to the police station where he learns why she’s so desperate for a partner. When he finds out she’s flying back to London, Kinji realizes she could be the Butei killer’s next target!

When a kidnapper after supernatural mercenaries targets Kinji’s obsessive friend, Aria volunteers to guard her 24/7. Roped in as a second bodyguard, Kinji gets caught in the middle of a constant cat-fight!