Transformation: I Still Have Childhood Sweethearts in My First Battle

(Originally called "Fantasy World") [World War I + overhead + no system + imagination + "order disease" + some kind of spiritual kinship with the Cthulhu mythology + single] Odile, who grew up in a monastery, joined the army with his childhood sweetheart Durand and the passion to fight for France. But there seemed to be something wrong with the enemies they saw on the battlefield... Wait, even my own people are not right. ... Why are they all acting so strange? Why is it different from the nuns, the stories, and the history? Which battle is this? (I don't know why I am writing these things, I am just writing, writing one word, writing two words, writing three words. Then when I react, the article is finished, that's it)