The Black Dragon of the Mirrors (Male Ryuga Reader x Crossover)

Y/n L/n was a Boy who has been abused and neglected by his family. He then decide to run away and never look back he then found a strange deck of cards and it contained a black dragon. It's name was DragBlacker the two of them shared a bond and when Y/n learned about the mirror world and about some of the riders abusing powers he decided to eliminate and free the beast were contracted by the riders and give them to worthy successors. He soon found a rider who has the same goal and the both of them teamed up to succeed...the two became an Unstoppable duo.

(The characters except the Mc are not mine)