With the sudden emergence of dragons, the world underwent a drastic transformation. Soon, supernatural girls known as 'D' with dragon powers manifested among humans. Mononobe Yuu, the sole male 'D', found himself thrust into Midgard, a school for 'D' girls, where he encountered Iris in a compromising situation. To his surprise, he discovered his long-lost sister Mitsuki also attended the school. As Yuu grapples with his new reality, a tale of potential betrayal and unlikely alliances begins to unfold in this unique school setting. Brace yourself for an unparalleled saga of the boy destined for darkness and the underachieving girl in a riveting School Battle Action!