Frequent panty disappearance incidents. Not only from the lockers at sports gyms or laundry in vacant homes, but also women being robbed of their underwear on night streets. Amidst this, a large quantity of women's underwear was discovered at a certain all-boys school. There are suspicions of a connection to a series of continuous theft incidents, but due to the school being a sacred domain, an undercover investigation was conducted in secret. The one chosen for this task was the female student investigator Tsukasa Aoi, who excels in disguise.
