Office worker Mitsuki Nagisa is having tea at a cafe during her lunch break when she sees a suspicious woman with nothing on underneath her coat. Out of curiosity, she follows her and finds that she suddenly gets naked outside and starts masturbating, taking selfies. Mitsuki, who is hiding and watching, is also soaked between the legs... After that, Mitsuki returns to work and masturbates in secret in the office, but is not satisfied with that, so while playing with her smartphone, she discovers a website called "Exposure Quest"... Mitsuki becomes addicted to exhibitionism and repeats perverted acts at work, in the library, in front of vending machines, etc.