Unlimited Fafnir

The world was forever altered by the sudden emergence of monstrous beings known as dragons. In response to this unprecedented threat, a select group of girls born with draconic abilities—designated as "D"—arose within humanity. Among them exists a singular anomaly: Mononobe Yuu, the only male "D" in the world. Kept hidden from society, his secret existence is abruptly upended when he is forcibly transferred to Midgard, an elite academy exclusively for female "D" students. His arrival is marked by an awkward encounter with a student named Iris, who he accidentally sees unclothed, and an unexpected reunion with his long-lost sister, Mitsuki, leading to his official enrollment at the school. Beneath the surface of academy life, a far darker reality looms. Yuu harbors the skills of a supreme assassin, burdened with a grim contingency should the battle against the dragons demand it. Faced with the possibility of having to end Iris's life if all other options fail, he makes her a solemn promise, forging a fragile bond of trust between them. As these two unlikely allies—a lethal boy trained for death and a struggling girl searching for her own strength—prepare to face the approaching calamity, their unique story begins to unfold in an explosive tale of unlimited school battle action.