A salaryman gets a second life in a world that actually rewards him for being useful instead of disposable. The "rearguard" job sounds like support class filler until you realize it's the entire point: he's not the hero because he doesn't need to be, and his party doesn't need saving because he's actually there. Every mechanic serves the fantasy of being valued for exactly what you are, without apology or compromise.
Arihito never expected his mundane office job to end in a fatal accident. Instead of oblivion, he wakes in a labyrinth kingdom where death isn't permanent and adventurers called Seekers explore dangerous dungeons for profit and glory. He discovers he's been assigned an unprecedented job class: the rearguard. Rather than fighting on the frontlines, Arihito supports his party from the back, amplifying their attacks, bolstering their defenses, and healing their wounds with mysterious powers that grow stronger the more his companions trust him. The catch is unusual. Simply standing behind his all-female party members causes them to grow genuinely fond of him, a mechanic that seems almost too good to be true for someone escaping years of corporate dehumanization. With his newfound freedom and unexpected ability to make a real difference in people's lives, Arihito throws himself into the adventuring life. What begins as a chance to start over transforms into something deeper as he learns that his rearguard abilities might unlock secrets the kingdom didn't know existed.