Sony's eBook store already have titles from some of the larger publishing houses, the Japanese books aren't exactly in epub format, but it is something closely related (Calibre doesn't recognize those files). Unless Sony have written exclusivity into their deals, all those titles should be easy to port to Kobo. I'm sure Amazon has the resources to port them to KF8 as well. Kobo is priced under the Sony PRS-T1, I'm fairly sure Kindle will have the same price point.
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