Hoshimawari no Revia

Living quietly in the depths of a quiet forest, Sheena, a reincarnated person who lost her family, and an old traveler who knows the world, are together. Sheena's magical powers have been strong since she was a child - so strong that they are called "curses". One day, a holy knight named Fel, who has been asked to defeat a witch, crosses Sheena's magical barrier and visits her. However, he is attacked by a forest beast, but is saved at the last moment by Sheena's overwhelming magic and..."Would you like to take me as your apprentice?"

A fantasy about a love journey that begins with an apprenticeship, woven by a reincarnated strongest magician who looks like a little girl and a carefree younger exiled holy knight.

(Source: Kadokawa, translated)