Nanami, a busty girl with a plain appearance who is deprived of sexual opportunities because of her plain appearance and indulges only in perverted delusions. Like her appearance, she has a gentle personality. She has a plain job and has only had one sexual experience with a man. She harbors a sexual desire to be treated terribly by a man. She accidentally discovered a perverted circle. For 148 minutes, she documents her transformation from a plain girl to a depraved one by exposing her sexual preferences.