Haikaburi to Bourei-tachi

The boy who was supposed to be dead had mysteriously returned to life.
But as things stood, he’d vanish again in three days.
In the midst of a war-torn city, the main character—a commanding officer—throws everything he has into keeping the boy alive.
What he uncovers is the unsettling local legend of a witch.
This is a military-themed fantasy novel.

[Translated from the dlsite]