What’s going on in Japan?
Earthquakes are common in countries such as Japan, Chile, etc. This is given by plate tectonics, where Japan is on the edge of the Eurasian, North American, Pacific and Phillippine plate, which causes more frequent seismic activity than elsewhere.
I think they have wasted all the plot of The Promised Neverland, it had very good parts that have been skipped... and better not to talk about the end, it seems as if they wanted to end the show quickly, it’s impossible to summarize so many chapters in only 6 episodes