Sorcerous Stabber Orphen: The Witch’s Salvation

Orphen and his sister in law Azalie are genius sorcerers. They are both studying at [Tower of Fangs], a prestigious training school for sorcerers.
One day Azalie performed a forbidden ritual, transformed into a terrifying monster, and disapeared from [the Tower of Fangs]. Orphen left [the Tower of Fangs] which tried to erase the existence of Azalie. Orphen sets on a journey to find Azalie

Majutsushi Orphen Hagure Tabi: Majo no Kyuusai-hen,
Majutsushi Orphen Haguretabi: Majo no Kyuusai-hen,
Majutsushi Oufen Hagure Tabi: Majo no Kyuusai-he, 
魔術士オーフェンはぐれ旅 魔女の救済編