Mizumo's life turns upside down when she stumbles upon one of her classmates running around naked at the college cultural fair. Quickly brainwashed and trapped playing a twisted game of tag where "it" is forced via hypnosis to stay completely naked until she tags the next girl, Mizumo has to deal with the dawning realization that she enjoyed her naked dash through town a lot more than she should have...

... and then the blackmail begins.