Due to the constant mistreatment she received while working for an advertising agency, Kanako Nishino—an emotional girl with a penchant for animal-based puns—decided to quit her job and search for a better one. To her surprise, Kanako finds out that the new company she has applied for is actually an assassins' organization, and she passes the entrance exam with flying colors! Kanako begins her new and exciting life as a professional assassin. [Written by MAL Rewrite]