He is the founder of Blade (a famous assassination organization), and she is an orphan he adopted; although he is forty, he has the appearance of immortality, and she is sixteen, but possesses boundless magical illusions; unknowingly, he fell in love with her, but she fell in love with a person who should not love; how should he save his love? And will she fall in love with him?... Everything is exciting, all in Invincible Blade!