Welcome to the Q&A Forum

Thanks for the clarification. I can't really comment intelligently without knowing more about the nature of the site and the intended audience. But may I  gently suggest you might want to think about the issue more broadly than as a technical SEO issue? For instance, why do you assume that English readers wouldn't be interested in Japanese holidays when you also say many readers are bilingual? If you made an editorial decision to publish everything in both languages, the SEO piece would look very different. I always advocate settling the editorial issues first, then plugging in the SEO component.

Hi, I'm the person behind SEO at Unbounce. There is no technical SEO drawback. Unbounce allows you to directly control all of the elements of your on-page SEO. You can even employ rel="canonical" if you are so inclined to indicate which variation Google should pay the most attention to. If you have any questions feel free to contact me: Carlos@unbounce.com

Hey Dan, great tips. What do mean by clean up all easy phrases?