Yola friends!

I recently found an old Manga for Kingdom hearts that I got around 6 years ago or so and I have no Idea where to find the sequels since there are different versions of the series. If any kingdom hearts fans see this and can help me find the sequels to the book I would be very grateful!
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I have no other knowledge about Kingdom Hearts other than the fact that I played through the game Kingdom Hearts 358/2 days. I'd really like to get into this, but have nowhere to start.