銃皇無尽のファフニール (Series) favorite_border

[DeepL Translation - needs review] Introduction to Volume 1: The world was transformed by the sudden appearance of monsters known as dragons. Soon after, a group of girls with the power of dragons, called "D", are born among the humans. Yu Monobe, the only male "D" whose existence is kept secret, is forcibly thrown into Midgal, a school for "D" girls, and sees Iris, a student at the school, naked. He is also reunited with his estranged sister, Fukatsuki, and enrolls in this academy. ......

(Translator: DeepL)