Ash Blake, a senior at Ansullivan Dragonar Academy, is no typical student. Not only does he have the ability to ride any dragon, but his own Steed, Eco, has the body of a beautiful young girl instead of a dragon!Ash, Eco, and Sylvia have returned from their trip to Albion Forst, where Ash met the Mother Dragon and learned crucial information that helped put Eco's mind at ease. But Sylvia's bold behaviour has left the relationship between the three of them anything but easy...

The Ansullivan 500-Year Festival is well underway, but the festive air won't last for long. A parasitic black crystal has attached itself to Oscar's dragon, causing both rider and steed to go berserk--just in time for their showdown with Ash. The grand finale of Dragonar Academy is here at last!

Ash Blake may be a senior at Ansullivan Dragonar Academy, but he's not your typical student. Not only can he ride any dragon, but his own Steed, Eco, has the decidedly un-dragon-like body of a beautiful young girl! As preparations begin for the Academy's 500-Year festival, the student council's vice-president returns to school after a long absence. But his focus doesn't seem to be on the festival at all. He's got other goals in mind - like making both the student council president and Eco his very own...!

Sylvia, the fourth princess of Lautreamont, has grown up feeling overshadowed by her eldest sister's accomplishments, while Veronica, a battle-hardened war hero, is ruthless in demanding that her younger sister live up to her expectations. When the infamous terrorist known as Avdocha comes to Lautreamont, wanting nothing less than to take Veronica's head, the younger Sylvia becomes her bait that will lure Veronica into a trap. Ash Blake must use his ability to command any dragon at will in order to rescue Sylvia. But can his heroics help Sylvia hold her head high and fight back as a proud princess of Lautreamont?

The Mother Dragon--a mysterious being even to the Dragonars she gifts with her offspring--has summoned Ash to Albion Forest. Accompanied by Eco and Sylvia, Ash obeys, hoping to learn more about Eco's nature: Why does Eco have such a human body? Will she be able to control her power? And how can he help her be happy again...? But answers about Eco's aren't all that await the trio in the forest. It's time for Ash to learn the truth about what happened to him and Sylvia there so many years ago!

Cross Academy is attended by two groups of students: the day class and the night class. Yuki Cross and Zero Kiryu are the guardians of the school, protecting the day class from the Academy's dark secret: the night class is full of vampires!

The Rating Game with Sairaorg is days away, and the Gremory Familia is training hard to get ready while preparing for the Academy Festival. However, trouble strikes when Rias suddenly becomes upset with Issei, leaving the hapless bonehead bewildered about how to fix things. He’s not even sure why the prez is angry. Okay, he has one idea, but it’s got to be too far-fetched...right? Mending the pair’s relationship and defeating Sairaorg may require Issei to overcome his greatest challenge—and his deepest trauma!