Imperial Guards

Imperial Guards (皇国の守護者, Koukoku no Shugosha) is a manga series by Daisuke Satou with illustrations by Yuu Itou. It was serialized in Ultra Jump.

Plot
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.