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You can stream Unlimited Fafnir (2015) on Crunchyroll with a subscription.

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?

A lone male student must navigate an academy filled with superpowered girls who possess the essence of ancient dragons. This supernatural school setting turns the struggle for survival into a chaotic battle of elemental combat and unexpected social friction.