@Kuromatsu its not ununique because others have it, i mean weve seen like 7 so far and like 2 werent japanese meaning the total number is probably less than 10000 across the whole world, thats less than half a half a half of a percent (0.000125%) But I think you're missing a possible story arc, if he's not the only one dreaming it means he's not the only one with a connected soul meaning he could and probably will encounter other earth dreamers in that world. Maybe even an enemy who tries to do things in BOTH worlds. Also at least personally I've never seen another story with this specific plot of connected souls giving power/knowledge across worlds so thats pretty special