Infirmary

The Nurse, syringe, and  tranquillizer  are located in this room for  kidnapping. (The Nurse is just a placeholder model at the moment and can't be interacted with yet.)

The Dev has stated that in future builds of the game  Yandere-chan will have to find a way to take the tranquillizer without the nurse noticing, for example, Yandere-chan can poison another student's food to distract the nurse.