Peaceful and quiet Shiratama Tower.
A human man appears before Yuyuko, who is fed up with the boredom.
As she listens to the man's stories about the human village, Yuyuko becomes curious about the world outside of Shiratama Tower.
Then, one night, she witnesses the man masturbating in his room...
The story of Yuyuko-sama's transformation into a sex slave at the hands of a human male.​