Airi continues to suffer from the nightmare of being chased by a masked man and tightening her neck after becoming a woman. There was no clue to find the cause, and Airi, who couldn't distinguish between dreams and reality, was drawn to a hospital. I could smell a deafening scent, but when I pulled the doorknob, the masked man in my dream was beckoning me ... Although I think that I should never enter, my body starts walking to the clinic and consults. After being asked some psychological tests, what was waiting for me ...