Majo to Kimagure

He has only one duty: to protect the fort. Ever since he could remember, the Knight Caindel has been earnestly defending the fort, until one day a girl took up residence in the fort and began to upset his destiny. While the two develop a strange friendship, the footsteps of a mysterious army, the "Demon Army," are quietly approaching from the border.

The predecessor to "The Witch and the Beast"