(READ) Little Author's Note

After being miraculously rescued by Azazel and brought to Goro and Miki Hyoudou, Yuuto became Issei's adoptive brother and took the name of Yuuto Hyoudou, also known as Kiba by Issei and their friends. one day, Kiba awakened his Sacred Gear, Sword Birthing, and learned deeper about the supernatural world. He swore to protect his brother Issei and his parents.
One day, Issei awoke his Sacred Gear -Before the Fallen Angels began their schemes in Kuoh- and it turned out he was The Red Dragon Emperor. And Ddraig, locked inside the Boosted Gear, became one of Issei's guides into the Supernatural World.