A 7-year-old apartment building located a 7-minute walk from the station, offering convenient city access and fully furnished with appliances—an attractive rental property managed by a popular management company. One night, a male employee of this company gives in to his hidden desires and obtains the master key kept under strict control. His target: breaking into the rooms where young women live. Women in their early 20s return home, select cosplay outfits displayed in their rooms, and change clothes. After trying on several costumes, they chat on the phone with fellow cosplayers, discussing event plans. Unaware of what’s about to happen, they drink water, then lose consciousness while still dressed in their costumes. From the balcony, the man quietly watches the scene unfold before moving in to take advantage of the helpless, unconscious cosplayers.