Lieutenant Cole Mercer's squad has always known the price of heroism. When a nuclear catastrophe threatens millions, four soldiers are willing to pay it—until a demonic invasion tears them from their world and into Tenria, a realm where magic flows through steam-powered machinery. In this new domain of arcane wonders and technological marvels, Cole unveils an extraordinary gift: the ability to harness magic itself. For the first time, victory doesn't demand the ultimate sacrifice—power becomes attainable through ancient mana channeled by modern innovation. It's the fantasy he never knew he needed. Yet Tenria mirrors the horrors Cole left behind. New world, same cruel choices. Millions still depend on him, and not everyone can be saved. Outnumbered and outmatched, Cole and his team face impossible odds in a war that will test their limits. Perhaps in their struggle lies a timeless lesson: the world's greatest heroes are forged not from legends, but from ordinary people pushed to extraordinary lengths.