For some time now, ever since starting his 2nd year of High School, Yoroichi Kuma has found himself slightly at the mercy of a very erotic High School Gal. Aki Sakuramoji, a 17 year old gal with a body like Rei Suzukawa from Mankitsu Happening, an athlete aptitude and intellectual work ethic, Aki spends every moment of her own existence by constantly giving Yoroichi grief by continually taking off her clothes in front of him wherever he goes and pleasures herself relentlessly just fun, and he doesn’t even know why she does it. But, on a local school trip to the hospital, one volunteer DNA Test between the two of them will change EVERYTHING!!!!!!!!!!