Coworkers Aozora and Kuroda never got along. One day after a work dinner, Kuroda missed the last train, and through a strange turn of events ends up staying the night at her apartment. Drinking together again, the conversation drifts from work talk to dirty jokes. Getting worked up arguing back and forth, it somehow turns into: ‘If you're gonna talk that big, let's just try it!?’ — and things spiral from there...