A Tale of the Secret Saint ZERO

Fia always dreamed of becoming a knight. Born into a family of knights, she’s the least talented among them, but she still clutches to her hope and trains with everything she has. When the day comes for her to slay a small demon and prove her worth, she ends up face to face with a dragon instead! A deadly injury makes her life flash before her eyes…and she suddenly remembers her former life, when she was a powerful Saint in a bygone era who defeated the Demon King. That life ended in pain because of who she was, making her fear ever becoming a Saint again. Now that the magic from her previous life has been rekindled, she may become a more powerful knight than she ever dreamed–if only she can survive long enough! (Source: Seven Seas Entertainment)

The strongest knight meets a young saint with extraordinary power… In the Kingdom of Nave, the princess is six years old and born blind. She lives in the "Forest of Lent," far from the royal capital, because the king was worried about her being drawn into political disputes. But now the king dispatches Sirius, vice-captain of the Unicorn Knights, to "bring her home." (Source: Comic EarthStar, translated)