Rena works part-time at a convenience store, but her stubborn personality and desire to do things her own way have made many customers unhappy, forcing the manager to constantly resolve issues for her. Not only that, but her constant closeness with her boyfriend, who also works there, has made the manager even more annoyed. One day, the store suddenly loses power, and the door cannot be opened, trapping the two of them there for 24 hours. With only the two of them, Rena continues to maintain her arrogant attitude, constantly yelling at the manager, pushing him to his breaking point...