Kazuya is invited to East Genetics Academy to meet the #1 ranked third-year Pandora, Cassie Lockheart, who possesses Stigmata from his late sister, Kazuha. Despite her potential, she explains she plans to retire after graduating to become a novelist. As Kazuya returns home, Sister Margaret reveals that Satellizer also possesses six of Kazuha's Stigmata, but showed little compatibility with them. Cassie reveals to her teacher Milena that the reason she doesn't want to join the Chevaliers, the Pandora elite, was because she was there when Satellizer attacked the playboy Limiter when she was still a student at East Genetics, and Satellizer's resolve to never give up no matter how many times Cassie put her down made her scared and realize how weak she was. Just then, East Genetics is attacked by a group of Type S Nova who exhibit abilities that have never been seen before, overwhelming the students and absorbing some of the Pandoras, including Cassie and Milena.
Eager to follow in the footsteps of his fallen sister, Kazuya enrolls at West Genetics Academy, a training facility for buxom heroes known as Pandoras. These courageous schoolgirls are genetically-enhanced with enough sex appeal to cripple a man – and the superhuman strength to slaughter aliens by the dozen. Kazuya’s role is that of Limiter, a Pandora’s battle partner, and he quickly sets his sights on the most feared beauty in school, Satellizer el Bridget. This full-figured annihilator of aliens is as desirable as she is deadly, but rubbing her the wrong way could lead to gross bodily harm. Can Kazuya forge a bond with his new partner and rise to the top of the ranks at West Genetics? Or will he fall victim to the mysterious bloodlust lurking within Satellizer?
