A brief description of the Hagure Seirei Ino Shinsatsu Kiroku ~ Seijo Kishi-Dan To Iyashi No Kamiwaza ~ manga:
Glas loses its meaning in life when it’s in a spirit call ceremony. He is chosen by a spirit with whom you cannot become a warlock. However, he is given a second chance and receives royal orders to fight on the front line as a spiritual medic, along with the Princess knights. His spirit is capable of curing anything. The chronicles of a new fantasy war begin!