Loki tells Yuu that it is his duty to prevent the girls at Midgar from becoming dragons and to kill them if they do. Iris has been having suicidal thoughts as she is dangerously close to becoming a dragon, but Yuu convinces her to think about living. The girls prepare for combat as Leviathan approaches the island.
Twenty-five years ago, the world suddenly changed when monsters called “Dragons” appeared; seeking to ravage the earth and find mates. Over time, superhuman girls possessing the powers of the dragons, called “D girls” were born. Yuu Mononobe is the only male “D” in existence and is forced to enroll at Midgar - an academy for D girls. At the academy, he accidentally runs into Iris, a delinquent D girl, while she’s naked, and even reunites with this long lost sister, Mitsuki, whom he was separated with at birth. Will Iris and Yuu, the boy who is supposed to become the strongest assassin, be able to challenge the seven dragons that threaten to destroy the world?
