Yuna, who usually works as an office lady at a travel agency, is more timid than most people and gets nervous over small things at work. One day, while in the bathroom at work, the emergency bell suddenly rings. Not realizing that it is an evacuation drill, Yuna is so scared that she runs outside without underwear. When a member of the team sees that she is without underwear, he mistakes her for seducing him and rapes her. Then, during a first aid training session later, the team members start playing with Yuna's body under the pretext of training her...