I'd buy from Amazon Japan because they were generally more generous with points back on eBooks than Rakuten (kinda like cashback), some of the manga series I read also would be delivered in noticably higher quality for whatever reason and crisper kanji is just easier to read. Since you can't have two accounts on one Kindle I had to DeDRM the books anyways even when I had a Kindle to read both English and Japanese books on the same device.
But since they implemented the DRM change I won't be buying anymore from them.
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