What is the history of gachapon capsule toys in Japan, and how long have they been so popular there?

I am writing a report for school, and I need the historical aspects of my topic. I don't even know what DECADE gachapon became popular to collect in Japan. I don't know the specifics of what got it popular in Japan WHEN it did. I have already researched things about it, but I just don't know the history. show more I am writing a report for school, and I need the historical aspects of my topic. I don't even know what DECADE gachapon became popular to collect in Japan. I don't know the specifics of what got it popular in Japan WHEN it did. I have already researched things about it, but I just don't know the history.
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