That’s a very original Anime. I was enjoying the anime from ... the second episode. From the beginning it was very complicated and the presentation itself was difficult. You must just get used to it ( especially to the narrator - it isn’t much used these days ). I must add points for the presentation of sex (16+), which is very delicate, natural, and not violent like it is in real life. Then the presentation of war and High School problems. You can say that the whole anime is very natural. And the point of view on love is different then usual. You will spend some time trying to think about the main characters… There is little humor… but there is! Don’t panic, some moments will be cheerful..
I found many symbols across the anime. And I think that the whole anime can be found as a symbol.