銃皇無尽のファフニール外伝　ブリュンヒルデ・ヴァルキリーズ (Associated Names)

With the sudden appearance of the monsters that came to be called dragons, the world had completely changed. Before long, supernatural girls with the power of the dragons, called “D”, were born within the human race. The secret existence of the only male “D”, the boy Mononobe Yuu, was forcefully thrown into the school where…