There are two ways to watch this film, and they are very different, though the difference is created through 12 min of live action footage inter-cut with the animation during the hour-long movie.
The short version is purely anime, following an occult battle between the Russians and Germany on the Eastern Front during WWII. Germany was infamous for its occult fascination and it has been been the basis of many movies and anime over the years. If it were demonstrably true, it is believable that the Allies would have developed their own counter-attacks in the same vein. But this story is ill-constructed, using an amnesia-based plot to allow many flashbacks to explain the situation, leaves far too many questions open, and then resolves it far too quickly and not through the main character’s direct actions.
The long version is exactly the same animation, but starts with and continues to inter-cut live actor, talking-head interviews with purported war veterans, historians, and psychologists. At first, it has the effect of making the animation feel either like Russian jingoism or like an apology for how thin the plot is. As the movie goes on, you realize these are actually actors who could have been characters in the animation. Clever premise, but it ends up shifting the movie to being a sort of re-enactment. Even the style of animation supports that feel as it uses rotoscoped war footage to provide some of the landscapes and attacks.
Unfortunately, neither viewing is particularly satisfying, though I think the original, short-version is probably the better of the two as it is less self-conscious.