Saga of Tanya the Evil Volume 1

The one thing I believe is most important to share is the title of the light novel. "The Saga of Tanya the Evil" is known as "Youjo Senki" in japanese, with the official translation per MAL being "The Military Chronicles of a Little Girl". I believe that the title more aptly fits the tone of the light novel. The book is not overly concerned with Tanya being some war hero, she is effectively the POV character that we view the war through in abstract. The Anime and Manga adapt the source material in unique ways that do not represent original aside from the general events. If you are here to see either the Manga or Anime in its original form, you need to understand that they are tonaly different. The difference in tone does not make any of the forms massively better or worse, just different.