That is how I would sort every military-adjacent media I’ve watched/read in Japanese from easiest to hardest:
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ヨルハ 真珠湾降下作戦記録 1 | L27 | Vie's review of ヨルハ 真珠湾降下作戦記録 1 | Natively
The most accessible introduction to military jargon that I know. I don’t hear anyone talking about it but I liked it quite a bit. -
怪獣8号 S1 | L31
Entertaining shounen action but nothing really ground-breaking. Does not contain many parts heavy on military-vocab so it is not that hard overall -
進撃の巨人 | L31 | Vie's review of 進撃の巨人 S1 | Natively
A favorite of mine. Peak anime with a heavy dose of military compound terms. Not much in the way of guns though. I found it very challenging but it was too interesting to give up.
Watch out that the difficulty of the Final Season is for some reason a sudden two-fold increase compared to previous seasons. -
86―エイティシックス― S1 | L32
Spider-like mechas manned by oppressed ethnic group fight in a war-ridden battlefield and receive orders and tactical information from a “handler” in a remote command center. Very very challenging. I think its Natively level could be pushed up more in my opinion. -
銀河英雄伝説 S1 | L34??
The absolute hardest thing I’ve ever seen in my Japanese life, wtf. I gave it a try but the kanji compounds are so long and so frequent that the subtitles look like they’re written in Chinese. Only time you finally see some hiragana is when an aristocrat starts explaining some elaborate political scheme in fancy quasi-archaic Japanese. I knew it was gonna be hard but I figured that with over 100 episodes, I will eventually get the hang of it (I overestimated myself)
While exploring those anime/manga, I realized that I really liked the command center scenes so I also made a list that tracks those: Command centers not in space | Japanese list by Vie | Natively (Rather specific, I know)