The world, presumably from the past, is of course quite different from the present. But despite a number of seemingly unsolvable problems—including the lack of any understanding of how they could possibly return to their own time—the Shield Hero from the past seems like a fairly adequate person, and there is also a local technical genius with him. So, it doesn’t look like everything is lost.
The only trouble is that Naofumi’s suspicion won’t let him relax his vigilance, and somewhere on the horizon a new Wave is looming…