KOUKOKU NO SHUGOSHA

An elite military unit conducts its duties alongside sabertooth tigers trained to assist their human masters. The Royal Kingdom invades the Empire in their desire for world dominion...after the disastrous opening battle of the war, the unit fights to save not only itself but their comrades from the enemy. Note: Runner-up in the 9th Japanese Media Arts Awards, the 11th Tezuka Cultural Prize, and the 1st Manga Taisho Awards. — Description from AniList community (anilist.co).