Hategaikaku no Bannin

Far beyond the reach of the castle walls lies the Far Frontier, home to the "Guardians"—a group of watchmen whose duties consist of little more than idle patrols. Ashath, an aristocrat, is assigned to this remote outpost after being exiled for leading his company of soldiers to their demise. Burdened by the guilt of being the sole survivor, Ashath is tormented by relentless nightmares—until Durant, a gifted mage, uses his powers to free him from this vicious cycle. Despite Durant's sharp tongue, his clumsy kindness reaches Ashath, leading him to confess, "I think I've fallen for you."

(Source: Kuma)