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Didn’t mean to unlikeΣ( ￣□￣||)
Sorry I want to like not dislike Σ(っ°Д °;)っ
http://www.mangago.me/read-manga/rikugun_renai_shikan_gakkou/
This is that one you're mentioned
Im pretty sure this is a sequel to another story I once read, the dude was his commander/teacher while the boy was preparing to join the army or something