I have to say I dislike the mechanism where the party exp is shared even when only a single member is doing all the killing and the rest are doing nothing but hiding in the bushes. It's so stupid. If that doesn't exist in an isekai, then it's going to be the last strike gets all the exp system (which also exist in this story, naturally, which is how they level up from 0 to 1). So, high level guys and gals take a noob with them, find a dragon and beat it until 1 HP remains. Then the noob lands a single hit with a dagger. The dragon dies, the noob gets a million exp and becomes immediately level 30 or something. As far as isekai authors are concerned, that's perfect storytelling.