Blade Dragons were originally civilians.

It was abducted by the Grand-Shadow, a monster organization, and underwent bio-modification as a candidate for an executive monster, and was reborn as an oriental dragon-shaped cyborg.

After being reborn as a blade dragon, he escaped from the organization.
He has inherited his original human memories intact and holds a strong grudge against Grand-Shadow for stealing his life.
He has only one wish: the destruction of Grand-Shadow.
For this reason, he continues to fight alone today. To defeat all the monsters.