With Basilisk headed towards Midgar, Class Brynhildr heads to an uninhabited island to draw Basilisk away from Midgar knowing that it is after Tear. On the way to the island, Mitsuki and Lisa are at odds with each other over Miyako's death. Mitsuki explains her relationship with Miyako to Yuu. She was very close friends with Miyako, but she became a dragon when the Kraken invaded Midgar. Miyako ordered Mitsuki to kill her and Mitsuki reluctantly complied. With Yuu's help, Mitsuki and Lisa make amends with each other.
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?
