when you were 3 year old, you have been fallen in the river but something or someone saved you. You remember that was a dragon, a big, long, black and blue one many years pass, you visit that river again and when suddenly your friend Giyuu came and sit next to you to chatting then someone push you to the river and Giyuu immediately turn to that dragon and saved you again. When you wake up, you see you're laying on that dragon and the dragon is trying to swim back to the side