Fairy Tail: I Can Contract with the Dragon Slayer

Four hundred years ago, the giant dragon had a trump card to fight against the Black Dragon King. The sixth special person was selected. Four hundred years later, he awakened again due to the appearance of Natsu. Roy, who lost his memory, found that he was holding a strange card box in his hand, and contracted with the Dragon Slayer Mage. He could make the nine-headed contracted beast sleeping in his body evolve into a dragon, and gradually regain his memory. Totoro of the lineage of the Transcendent King, the stars beyond the spirit of the constellations, the dark side of the mirror world of Edras... Erza's second form of transformation magic, Gajeel's ability to change by eating different metals, the flame twin dragon mode formed with Natsu... As Roy's memories emerge, everything has changed dramatically, including his character's abilities. "Hey~ Advent, the contract has arrived..." Watching the card being used, the armored figure was surrounded by the crimson dragon. Natsu, Erza, Kana, and Lucy's eyes widened. "Is this dragon slayer, costume change, card... Or contract magic?" "What kind of dragon is this? Why haven't I seen it before?" "Love! Natsu, do you think that is the sixth generation dragon slayer?" Although everything changes, only one thing remains unchanged. Fairy Tail is always the most family guild!