Synopsis: Unlimited Fafnir

Assigned to Midgard, an all-girl's school, is Second Lieutenant Mononobe Yuu. His sister, Mitsuki is the student council president there, and both siblings possess "D" powers, essential in combatting dragons. Iris Freya is a fellow student struggling with her "D"-related studies. Together, they strive to thrive in a perilous reality.