Shimura Kyuuchi, a meddlesome high-school boy, gets hit by a truck while trying to save a cat and wakes up in a dangerous world, in the body of a desperate girl.

18-year-old Hondanaka Koyuki is an apprentice spy. Her current job is to infiltrate a party in order to learn the planned fate of a specific shopping center. However, she is inexperienced at sneaking about and is not particularly suave. Will she and her mentor be able to complete their task?