So, you know how when you make a drawing or a painting, you can change it or make it look different later on? That's kind of like what happened with the Amami Reversion Movement.
Amami is a group of islands in Japan, and a long time ago, these islands were ruled by their own king. But then, a bigger country called Japan took over and became the ruler of the islands. However, some people on the islands didn't like this and wanted to go back to being their own independent place.
The Amami Reversion Movement started in the 1960s, when these people started speaking up and saying they wanted things to go back to the way they were before Japan took over. They held protests and talked to their leaders about it.
Eventually, after many years of fighting for their cause, the government of Japan finally agreed to give Amami more control over their own affairs. This is kind of like when you get to decide what color your drawing is going to be or what kind of patterns you want to use - it's like being in charge of your own creation.
So now, Amami still belongs to Japan, but they have more say in how they are governed and what happens on their islands. And that's basically what the Amami Reversion Movement was all about - people fighting for more control over their own home.