With the Dragon Balls around, any mistake can be undone. In extreme circumstances, even people who have died can come back to life. Up until this point, it had been repeatedly treated as a given. Unfortunately, however, such a useful tool doesn’t actually exist. In that case, for the children watching this work in the real world, where the Dragon Balls don’t exist, to express this theme of, “Just how are we supposed to resolve problems in a world without the Dragon Balls?” …It’s something that, because we love the series Dragon Ball so much, we felt we just couldn’t get around.So, based on the concept that “the Evil Dragons were corruptions born as the price of the wishes granted up till now”, we’d have the people who gave rise to those corruptions take responsibility for them one by one, not by relying on the Dragon Balls, but by their own strength. That’s the kind of story we went with. In the end, by taking responsibility for all seven, the Dragon Balls are purified, and Goku & co. bring back all the people who have died up to that point, as they’e always done; but normally, the cities are restored at the same time that the people are revived. This time, however, what’s conclusively different from usual is that only the people are revived, and the deep scars in the cityscape remain. In other words, the people have to restore the broken city, not with the power of the Dragon Balls, but with their own hands. I wrote that scene with that sort of desire in mind. The Dragon Balls are clearly a tool like something out of a dream. However, what’s needed to achieve a dream that lies past predicaments to get out of, is ultimately “the strength of people”. The entire theme of the series up to this point was in that. It’s because we wanted people to perceive that intention that we made the Dragon Balls the final “enemy”.