Jumping in here since I don't want you to make the same mistake I did—oh god, before you start KH2, read a detailed summary of Chain of Memories or watch the cutscenes (which contain 95% of the plot) on kh13.com or something because otherwise shit will make NO SENSE in KH2. Trust me.

The manga is fun but sort of cracky, and for KH2 it's unfinished. I recommend it for funsies but not the whole plot.